| Schedule of Segment Reporting Information | 
  
    |   | 
      | 
    Marine Technology Business (Products) | 
      | 
      | 
    Marine Engineering Business (Services) | 
      | 
      | 
    Overhead | 
      | 
      | 
    Total | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Three Months Ended April 30, 2021 | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Revenues from External Customers | 
      | 
    $ | 
    4,184,409 | 
      | 
      | 
    $ | 
    1,188,667 | 
      | 
      | 
    $ | 
    - | 
      | 
      | 
    $ | 
    5,373,076 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Cost of Revenues | 
      | 
      | 
    1,022,701 | 
      | 
      | 
      | 
    600,771 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    1,623,472 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Gross Profit | 
      | 
      | 
    3,161,708 | 
      | 
      | 
      | 
    587,896 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    3,749,604 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Research & Development | 
      | 
      | 
    538,878 | 
      | 
      | 
      | 
    106,403 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    645,281 | 
      | 
 
  
    | Selling, General & Administrative | 
      | 
      | 
    800,622 | 
      | 
      | 
      | 
    552,067 | 
      | 
      | 
      | 
    427,312 | 
      | 
      | 
      | 
    1,780,001 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Operating Expenses | 
      | 
      | 
    1,339,500 | 
      | 
      | 
      | 
    658,470 | 
      | 
      | 
      | 
    427,312 | 
      | 
      | 
      | 
    2,425,282 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Income (Loss) from Operations | 
      | 
      | 
    1,822,208 | 
      | 
      | 
      | 
    (70,574 | 
    ) | 
      | 
      | 
    (427,312 | 
    ) | 
      | 
      | 
    1,324,322 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Other (Expense) Income | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Other Income | 
      | 
      | 
    68,583 | 
      | 
      | 
      | 
    16 | 
      | 
      | 
      | 
    846 | 
      | 
      | 
      | 
    69,445 | 
      | 
 
  
    | Funding from Paycheck Protection Program | 
      | 
      | 
    122,327 | 
      | 
      | 
      | 
    436,574 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    558,901 | 
      | 
 
  
    | Interest Expense | 
      | 
      | 
    (3,518 | 
    ) | 
      | 
      | 
    (4,544 | 
    ) | 
      | 
      | 
    (5,579 | 
    ) | 
      | 
      | 
    (13,641 | 
    ) | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Other Income (Expense) | 
      | 
      | 
    187,392 | 
      | 
      | 
      | 
    432,046 | 
      | 
      | 
      | 
    (4,733 | 
    ) | 
      | 
      | 
    614,705 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Net Income (Loss) before Income Taxes | 
      | 
      | 
    2,009,600 | 
      | 
      | 
      | 
    361,472 | 
      | 
      | 
      | 
    (432,045 | 
    ) | 
      | 
      | 
    1,939,027 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Income Tax (Expense) Benefit | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Current Tax Benefit | 
      | 
      | 
    72,292 | 
      | 
      | 
      | 
    237,670 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    309,962 | 
      | 
 
  
    | Deferred Tax (Expense) | 
      | 
      | 
    (102,585 | 
    ) | 
      | 
      | 
    112,550 | 
      | 
      | 
      | 
    (51,021 | 
    ) | 
      | 
      | 
    (41,056 | 
    ) | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Income Tax (Expense) Benefit | 
      | 
      | 
    (30,293 | 
    ) | 
      | 
      | 
    350,220 | 
      | 
      | 
      | 
    (51,021 | 
    ) | 
      | 
      | 
    268,906 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Net Income (Loss) | 
      | 
    $ | 
    1,979,307 | 
      | 
      | 
    $ | 
    711,692 | 
      | 
      | 
    $ | 
    (483,066 | 
    ) | 
      | 
    $ | 
    2,207,933 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Supplemental Disclosures | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Assets | 
      | 
    $ | 
    27,086,894 | 
      | 
      | 
    $ | 
    14,667,654 | 
      | 
      | 
    $ | 
    966,418 | 
      | 
      | 
    $ | 
    42,720,966 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Liabilities | 
      | 
    $ | 
    1,839,295 | 
      | 
      | 
    $ | 
    1,027,958 | 
      | 
      | 
    $ | 
    586,739 | 
      | 
      | 
    $ | 
    3,453,992 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Revenues from Intercompany Sales - eliminated from sales above | 
      | 
    $ | 
    504,411 | 
      | 
      | 
    $ | 
    90,443 | 
      | 
      | 
    $ | 
    675,000 | 
      | 
      | 
    $ | 
    1,269,854 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Depreciation and Amortization | 
      | 
    $ | 
    200,536 | 
      | 
      | 
    $ | 
    26,436 | 
      | 
      | 
    $ | 
    6,709 | 
      | 
      | 
    $ | 
    233,681 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | (Sales) Purchases of Long-lived Assets | 
      | 
    $ | 
    144,232 | 
      | 
      | 
    $ | 
    1,371 | 
      | 
      | 
    $ | 
    44,442 | 
      | 
      | 
    $ | 
    190,045 | 
      | 
 
   
  
  
    |   | 
      | 
    Marine Technology Business (Products) | 
      | 
      | 
    Marine Engineering Business (Services) | 
      | 
      | 
    Overhead | 
      | 
      | 
    Total | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Three Months Ended April 30, 2020 | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Revenues from External Customers | 
      | 
    $ | 
    1,691,199 | 
      | 
      | 
    $ | 
    1,598,019 | 
      | 
      | 
    $ | 
    - | 
      | 
      | 
    $ | 
    3,289,218 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Cost of Revenues | 
      | 
      | 
    406,853 | 
      | 
      | 
      | 
    956,951 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    1,363,804 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Gross Profit | 
      | 
      | 
    1,284,346 | 
      | 
      | 
      | 
    641,068 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    1,925,414 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Research & Development | 
      | 
      | 
    442,696 | 
      | 
      | 
      | 
    270,945 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    713,641 | 
      | 
 
  
    | Selling, General & Administrative | 
      | 
      | 
    692,177 | 
      | 
      | 
      | 
    527,039 | 
      | 
      | 
      | 
    313,994 | 
      | 
      | 
      | 
    1,533,210 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Operating Expenses | 
      | 
      | 
    1,134,873 | 
      | 
      | 
      | 
    797,984 | 
      | 
      | 
      | 
    313,994 | 
      | 
      | 
      | 
    2,246,851 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Income (Loss) from Operations | 
      | 
      | 
    149,473 | 
      | 
      | 
      | 
    (156,916 | 
    ) | 
      | 
      | 
    (313,994 | 
    ) | 
      | 
      | 
    (321,437 | 
    ) | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Other Income (Expense) | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Other (Expense) Income | 
      | 
      | 
    (327 | 
    ) | 
      | 
      | 
    16 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    (311 | 
    ) | 
 
  
    | Interest Expense | 
      | 
      | 
    (2,395 | 
    ) | 
      | 
      | 
    (3,959 | 
    ) | 
      | 
      | 
    (12,102 | 
    ) | 
      | 
      | 
    (18,456 | 
    ) | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Other (Expense) | 
      | 
      | 
    (2,722 | 
    ) | 
      | 
      | 
    (3,943 | 
    ) | 
      | 
      | 
    (12,102 | 
    ) | 
      | 
      | 
    (18,767 | 
    ) | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Net Income (Loss) before Income Taxes | 
      | 
      | 
    146,751 | 
      | 
      | 
      | 
    (160,859 | 
    ) | 
      | 
      | 
    (326,096 | 
    ) | 
      | 
      | 
    (340,204 | 
    ) | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Current Tax (Expense) Benefit | 
      | 
      | 
    (6,397 | 
    ) | 
      | 
      | 
    (4,045 | 
    ) | 
      | 
      | 
    45,268 | 
      | 
      | 
      | 
    34,826 | 
      | 
 
  
    | Deferred Tax (Expense) Benefit | 
      | 
      | 
    (1,354 | 
    ) | 
      | 
      | 
    142,793 | 
      | 
      | 
      | 
    (101,141 | 
    ) | 
      | 
      | 
    40,298 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Income Tax (Expense) Benefit | 
      | 
      | 
    (7,751 | 
    ) | 
      | 
      | 
    138,748 | 
      | 
      | 
      | 
    (55,873 | 
    ) | 
      | 
      | 
    75,124 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Net Income (Loss) | 
      | 
    $ | 
    139,000 | 
      | 
      | 
    $ | 
    (22,111 | 
    ) | 
      | 
    $ | 
    (381,969 | 
    ) | 
      | 
    $ | 
    (265,080 | 
    ) | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Supplemental Disclosures | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Assets | 
      | 
    $ | 
    21,256,131 | 
      | 
      | 
    $ | 
    14,231,702 | 
      | 
      | 
    $ | 
    1,050,834 | 
      | 
      | 
    $ | 
    36,538,667 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Liabilities | 
      | 
    $ | 
    2,907,719 | 
      | 
      | 
    $ | 
    1,380,925 | 
      | 
      | 
    $ | 
    921,492 | 
      | 
      | 
    $ | 
    5,210,136 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Revenues from Intercompany Sales - eliminated from sales above | 
      | 
    $ | 
    277,658 | 
      | 
      | 
    $ | 
    4,687 | 
      | 
      | 
    $ | 
    675,000 | 
      | 
      | 
    $ | 
    957,345 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Depreciation and Amortization | 
      | 
    $ | 
    94,599 | 
      | 
      | 
    $ | 
    2,745 | 
      | 
      | 
    $ | 
    4,112 | 
      | 
      | 
    $ | 
    101,456 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | (Sales) Purchases of Long-lived Assets | 
      | 
    $ | 
    (158,874 | 
    ) | 
      | 
    $ | 
    (8,441 | 
    ) | 
      | 
    $ | 
    14,554 | 
      | 
      | 
    $ | 
    (152,761 | 
    ) | 
 
   
  
  
    |   | 
      | 
    Marine Technology Business (Products) | 
      | 
      | 
    Marine Engineering Business (Services) | 
      | 
      | 
    Overhead | 
      | 
      | 
    Total | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Six Months Ended April 30, 2021 | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Revenues from External Customers | 
      | 
    $ | 
    7,932,688 | 
      | 
      | 
    $ | 
    2,490,847 | 
      | 
      | 
    $ | 
    - | 
      | 
      | 
    $ | 
    10,423,535 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Cost of Revenues | 
      | 
      | 
    1,916,976 | 
      | 
      | 
      | 
    1,442,033 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    3,359,009 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Gross Profit | 
      | 
      | 
    6,015,712 | 
      | 
      | 
      | 
    1,048,814 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    7,064,526 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Research & Development | 
      | 
      | 
    980,622 | 
      | 
      | 
      | 
    247,798 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    1,228,420 | 
      | 
 
  
    | Selling, General & Administrative | 
      | 
      | 
    1,534,447 | 
      | 
      | 
      | 
    1,119,626 | 
      | 
      | 
      | 
    939,294 | 
      | 
      | 
      | 
    3,593,367 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Operating Expenses | 
      | 
      | 
    2,515,069 | 
      | 
      | 
      | 
    1,367,424 | 
      | 
      | 
      | 
    939,294 | 
      | 
      | 
      | 
    4,821,787 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Income (Loss) from Operations | 
      | 
      | 
    3,500,643 | 
      | 
      | 
      | 
    (318,610 | 
    ) | 
      | 
      | 
    (939,294 | 
    ) | 
      | 
      | 
    2,242,739 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Other Income (Expense) | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Other Income | 
      | 
      | 
    70,619 | 
      | 
      | 
      | 
    34 | 
      | 
      | 
      | 
    846 | 
      | 
      | 
      | 
    71,499 | 
      | 
 
  
    | Funding from Paycheck Protection Program | 
      | 
      | 
    122,327 | 
      | 
      | 
      | 
    526,545 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    648,872 | 
      | 
 
  
    | Interest Expense | 
      | 
      | 
    (5,771 | 
    ) | 
      | 
      | 
    (9,695 | 
    ) | 
      | 
      | 
    (12,689 | 
    ) | 
      | 
      | 
    (28,155 | 
    ) | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Other Income (Expense) | 
      | 
      | 
    187,175 | 
      | 
      | 
      | 
    516,884 | 
      | 
      | 
      | 
    (11,843 | 
    ) | 
      | 
      | 
    692,216 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Net Income (Loss) before Income Taxes | 
      | 
      | 
    3,687,818 | 
      | 
      | 
      | 
    198,274 | 
      | 
      | 
      | 
    (951,137 | 
    ) | 
      | 
      | 
    2,934,955 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Income Tax Benefit (Expense) | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Current Tax Benefit | 
      | 
      | 
    84,945 | 
      | 
      | 
      | 
    237,670 | 
      | 
      | 
      | 
    12,072 | 
      | 
      | 
      | 
    334,687 | 
      | 
 
  
    | Deferred Tax (Expense) Benefit | 
      | 
      | 
    (113,740 | 
    ) | 
      | 
      | 
    264,636 | 
      | 
      | 
      | 
    (83,761 | 
    ) | 
      | 
      | 
    67,135 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Income Tax Benefit (Expense) | 
      | 
      | 
    (28,795 | 
    ) | 
      | 
      | 
    502,306 | 
      | 
      | 
      | 
    (71,689 | 
    ) | 
      | 
      | 
    401,822 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Net Income (Loss) | 
      | 
    $ | 
    3,659,023 | 
      | 
      | 
    $ | 
    700,580 | 
      | 
      | 
    $ | 
    (1,022,826 | 
    ) | 
      | 
    $ | 
    3,336,777 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Supplemental Disclosures | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Assets | 
      | 
    $ | 
    27,086,894 | 
      | 
      | 
    $ | 
    14,667,654 | 
      | 
      | 
    $ | 
    966,418 | 
      | 
      | 
    $ | 
    42,720,966 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Liabilities | 
      | 
    $ | 
    1,839,295 | 
      | 
      | 
    $ | 
    1,027,958 | 
      | 
      | 
    $ | 
    586,739 | 
      | 
      | 
    $ | 
    3,453,992 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Revenues from Intercompany Sales - eliminated from sales above | 
      | 
    $ | 
    875,040 | 
      | 
      | 
    $ | 
    139,644 | 
      | 
      | 
    $ | 
    1,350,000 | 
      | 
      | 
    $ | 
    2,364,684 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Depreciation and Amortization | 
      | 
    $ | 
    512,658 | 
      | 
      | 
    $ | 
    74,081 | 
      | 
      | 
    $ | 
    13,125 | 
      | 
      | 
    $ | 
    599,864 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Purchases of Long-lived Assets | 
      | 
    $ | 
    544,207 | 
      | 
      | 
    $ | 
    5,548 | 
      | 
      | 
    $ | 
    49,434 | 
      | 
      | 
    $ | 
    599,189 | 
      | 
 
   
  
  
    |   | 
      | 
    Marine Technology Business (Products) | 
      | 
      | 
    Marine Engineering Business (Services) | 
      | 
      | 
    Overhead | 
      | 
      | 
    Total | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Six Months Ended April 30, 2020 | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Revenues from External Customers | 
      | 
    $ | 
    5,324,011 | 
      | 
      | 
    $ | 
    4,646,186 | 
      | 
      | 
    $ | 
    - | 
      | 
      | 
    $ | 
    9,970,197 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Cost of Revenues | 
      | 
      | 
    1,062,530 | 
      | 
      | 
      | 
    2,707,813 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    3,770,343 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Gross Profit | 
      | 
      | 
    4,261,481 | 
      | 
      | 
      | 
    1,938,373 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    6,199,854 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Research & Development | 
      | 
      | 
    999,425 | 
      | 
      | 
      | 
    477,383 | 
      | 
      | 
      | 
    165,098 | 
      | 
      | 
      | 
    1,641,906 | 
      | 
 
  
    | Selling, General & Administrative | 
      | 
      | 
    1,560,175 | 
      | 
      | 
      | 
    1,163,335 | 
      | 
      | 
      | 
    701,378 | 
      | 
      | 
      | 
    3,424,888 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Operating Expenses | 
      | 
      | 
    2,559,600 | 
      | 
      | 
      | 
    1,640,718 | 
      | 
      | 
      | 
    866,476 | 
      | 
      | 
      | 
    5,066,794 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Income (Loss) from Operations | 
      | 
      | 
    1,701,881 | 
      | 
      | 
      | 
    297,655 | 
      | 
      | 
      | 
    (866,476 | 
    ) | 
      | 
      | 
    1,133,060 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Other Income (Expense) | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Other Income | 
      | 
      | 
    12,497 | 
      | 
      | 
      | 
    16 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    12,513 | 
      | 
 
  
    | Interest (Expense) | 
      | 
      | 
    (5,627 | 
    ) | 
      | 
      | 
    (7,641 | 
    ) | 
      | 
      | 
    (24,802 | 
    ) | 
      | 
      | 
    (38,070 | 
    ) | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Other Income (Expense) | 
      | 
      | 
    6,870 | 
      | 
      | 
      | 
    (7,625 | 
    ) | 
      | 
      | 
    (24,802 | 
    ) | 
      | 
      | 
    (25,557 | 
    ) | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Net Income (Loss) before Income Taxes | 
      | 
      | 
    1,708,751 | 
      | 
      | 
      | 
    290,030 | 
      | 
      | 
      | 
    (891,278 | 
    ) | 
      | 
      | 
    1,107,503 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Current Tax Benefit (Expense) | 
      | 
      | 
    19,436 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    (7,957 | 
    ) | 
      | 
      | 
    11,479 | 
      | 
 
  
    | Deferred Tax Benefit (Expense) | 
      | 
      | 
    (79,493 | 
    ) | 
      | 
      | 
    130,558 | 
      | 
      | 
      | 
    (88,354 | 
    ) | 
      | 
      | 
    (37,289 | 
    ) | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Income Tax Benefit (Expense) | 
      | 
      | 
    (60,057 | 
    ) | 
      | 
      | 
    130,558 | 
      | 
      | 
      | 
    (96,311 | 
    ) | 
      | 
      | 
    (25,810 | 
    ) | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Net Income (Loss) | 
      | 
    $ | 
    1,648,694 | 
      | 
      | 
    $ | 
    420,588 | 
      | 
      | 
    $ | 
    (987,589 | 
    ) | 
      | 
    $ | 
    1,081,693 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Supplemental Disclosures | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Assets | 
      | 
    $ | 
    21,256,131 | 
      | 
      | 
    $ | 
    14,231,702 | 
      | 
      | 
    $ | 
    1,050,834 | 
      | 
      | 
    $ | 
    36,538,667 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Liabilities | 
      | 
    $ | 
    2,907,719 | 
      | 
      | 
    $ | 
    1,380,925 | 
      | 
      | 
    $ | 
    921,492 | 
      | 
      | 
    $ | 
    5,210,136 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Revenues from Intercompany Sales - eliminated from sales above | 
      | 
    $ | 
    580,480 | 
      | 
      | 
    $ | 
    105,216 | 
      | 
      | 
    $ | 
    1,350,000 | 
      | 
      | 
    $ | 
    2,035,696 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Depreciation and Amortization | 
      | 
    $ | 
    277,592 | 
      | 
      | 
    $ | 
    46,425 | 
      | 
      | 
    $ | 
    9,403 | 
      | 
      | 
    $ | 
    333,420 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Purchases of Long-lived Assets | 
      | 
    $ | 
    440,727 | 
      | 
      | 
    $ | 
    1,152 | 
      | 
      | 
    $ | 
    48,519 | 
      | 
      | 
    $ | 
    490,398 | 
      | 
 
   
 | 
| Schedule of Disaggregate of Revenue from Contracts for Sale with Customers by Geographic Location | 
  
    |   | 
      | 
    For the Three Months Ended April 30, 2021 | 
      | 
 
  
    |   | 
      | 
    Marine | 
      | 
      | 
    Marine | 
      | 
      | 
      | 
      | 
 
  
    |   | 
      | 
    Technology | 
      | 
      | 
    Engineering | 
      | 
      | 
    Grand | 
      | 
 
  
    |   | 
      | 
    Business | 
      | 
      | 
    Business | 
      | 
      | 
    Total | 
      | 
 
  
    | Disaggregation of Total Net Sales | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Primary Geographical Markets | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Americas | 
      | 
    $ | 
    914,529 | 
      | 
      | 
    $ | 
    597,463 | 
      | 
      | 
    $ | 
    1,511,992 | 
      | 
 
  
    | Europe | 
      | 
      | 
    1,665,643 | 
      | 
      | 
      | 
    591,204 | 
      | 
      | 
      | 
    2,256,847 | 
      | 
 
  
    | Australia/Asia | 
      | 
      | 
    1,487,023 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    1,487,023 | 
      | 
 
  
    | Middle East/Africa | 
      | 
      | 
    117,214 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    117,214 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Revenues | 
      | 
    $ | 
    4,184,409 | 
      | 
      | 
    $ | 
    1,188,667 | 
      | 
      | 
    $ | 
    5,373,076 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Major Goods/Service Lines | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Equipment Sales | 
      | 
    $ | 
    3,090,462 | 
      | 
      | 
    $ | 
    93,505 | 
      | 
      | 
    $ | 
    3,183,967 | 
      | 
 
  
    | Equipment Rentals | 
      | 
      | 
    598,190 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    598,190 | 
      | 
 
  
    | Software Sales | 
      | 
      | 
    221,053 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    221,053 | 
      | 
 
  
    | Engineering Parts | 
      | 
      | 
    - | 
      | 
      | 
      | 
    778,369 | 
      | 
      | 
      | 
    778,369 | 
      | 
 
  
    | Services | 
      | 
      | 
    274,704 | 
      | 
      | 
      | 
    316,792 | 
      | 
      | 
      | 
    591,496 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Revenues | 
      | 
    $ | 
    4,184,409 | 
      | 
      | 
    $ | 
    1,188,667 | 
      | 
      | 
    $ | 
    5,373,076 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Goods transferred at a point in time | 
      | 
    $ | 
    3,311,515 | 
      | 
      | 
    $ | 
    93,505 | 
      | 
      | 
    $ | 
    3,405,020 | 
      | 
 
  
    | Services transferred over time | 
      | 
      | 
    872,894 | 
      | 
      | 
      | 
    1,095,162 | 
      | 
      | 
      | 
    1,968,056 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Revenues | 
      | 
    $ | 
    4,184,409 | 
      | 
      | 
    $ | 
    1,188,667 | 
      | 
      | 
    $ | 
    5,373,076 | 
      | 
 
   
  
  
    |   | 
      | 
    For the Three Months Ended April 30, 2020 | 
      | 
 
  
    |   | 
      | 
    Marine | 
      | 
      | 
    Marine | 
      | 
      | 
      | 
      | 
 
  
    |   | 
      | 
    Technology | 
      | 
      | 
    Engineering | 
      | 
      | 
    Grand | 
      | 
 
  
    |   | 
      | 
    Business | 
      | 
      | 
    Business | 
      | 
      | 
    Total | 
      | 
 
  
    | Disaggregation of Total Net Sales | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Primary Geographical Markets | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Americas | 
      | 
    $ | 
    513,638 | 
      | 
      | 
    $ | 
    1,010,109 | 
      | 
      | 
    $ | 
    1,523,747 | 
      | 
 
  
    | Europe | 
      | 
      | 
    519,990 | 
      | 
      | 
      | 
    587,910 | 
      | 
      | 
      | 
    1,107,900 | 
      | 
 
  
    | Australia/Asia | 
      | 
      | 
    620,386 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    620,386 | 
      | 
 
  
    | Middle East/Africa | 
      | 
      | 
    37,185 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    37,185 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Revenues | 
      | 
    $ | 
    1,691,199 | 
      | 
      | 
    $ | 
    1,598,019 | 
      | 
      | 
    $ | 
    3,289,218 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Major Goods/Service Lines | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Equipment Sales | 
      | 
      | 
    513,638 | 
      | 
      | 
    $ | 
    - | 
      | 
      | 
    $ | 
    513,638 | 
      | 
 
  
    | Equipment Rentals | 
      | 
      | 
    519,990 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    519,990 | 
      | 
 
  
    | Software Sales | 
      | 
      | 
    620,386 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    620,386 | 
      | 
 
  
    | Engineering Parts | 
      | 
      | 
    37,185 | 
      | 
      | 
      | 
    1,435,134 | 
      | 
      | 
      | 
    1,472,319 | 
      | 
 
  
    | Services | 
      | 
      | 
    - | 
      | 
      | 
      | 
    162,885 | 
      | 
      | 
      | 
    162,885 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Revenues | 
      | 
    $ | 
    1,691,199 | 
      | 
      | 
    $ | 
    1,598,019 | 
      | 
      | 
    $ | 
    3,289,218 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Goods transferred at a point in time | 
      | 
    $ | 
    377,411 | 
      | 
      | 
    $ | 
    - | 
      | 
      | 
    $ | 
    377,411 | 
      | 
 
  
    | Services transferred over time | 
      | 
      | 
    1,313,788 | 
      | 
      | 
      | 
    1,598,019 | 
      | 
      | 
      | 
    2,911,807 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Revenues | 
      | 
    $ | 
    1,691,199 | 
      | 
      | 
    $ | 
    1,598,019 | 
      | 
      | 
    $ | 
    3,289,218 | 
      | 
 
   
  
  
    |   | 
      | 
    For the Six Months Ended April 30, 2021 | 
      | 
 
  
    |   | 
      | 
    Marine | 
      | 
      | 
    Marine | 
      | 
      | 
      | 
      | 
 
  
    |   | 
      | 
    Technology | 
      | 
      | 
    Engineering | 
      | 
      | 
    Grand | 
      | 
 
  
    |   | 
      | 
    Business | 
      | 
      | 
    Business | 
      | 
      | 
    Total | 
      | 
 
  
    | Disaggregation of Total Net Sales | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Primary Geographical Markets | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Americas | 
      | 
    $ | 
    1,463,807 | 
      | 
      | 
    $ | 
    1,113,904 | 
      | 
      | 
    $ | 
    2,577,711 | 
      | 
 
  
    | Europe | 
      | 
      | 
    2,790,755 | 
      | 
      | 
      | 
    1,376,943 | 
      | 
      | 
      | 
    4,167,698 | 
      | 
 
  
    | Australia/Asia | 
      | 
      | 
    3,495,233 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    3,495,233 | 
      | 
 
  
    | Middle East/Africa | 
      | 
      | 
    182,893 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    182,893 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Revenues | 
      | 
    $ | 
    7,932,688 | 
      | 
      | 
    $ | 
    2,490,847 | 
      | 
      | 
    $ | 
    10,423,535 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Major Goods/Service Lines | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Equipment Sales | 
      | 
    $ | 
    5,883,949 | 
      | 
      | 
    $ | 
    314,462 | 
      | 
      | 
    $ | 
    6,198,411 | 
      | 
 
  
    | Equipment Rentals | 
      | 
      | 
    932,553 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    932,553 | 
      | 
 
  
    | Software Sales | 
      | 
      | 
    446,275 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    446,275 | 
      | 
 
  
    | Engineering Parts | 
      | 
      | 
    213,956 | 
      | 
      | 
      | 
    1,634,716 | 
      | 
      | 
      | 
    1,848,672 | 
      | 
 
  
    | Services | 
      | 
      | 
    455,955 | 
      | 
      | 
      | 
    541,668 | 
      | 
      | 
      | 
    997,623 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Revenues | 
      | 
    $ | 
    7,932,688 | 
      | 
      | 
    $ | 
    2,490,847 | 
      | 
      | 
    $ | 
    10,423,535 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Goods transferred at a point in time | 
      | 
    $ | 
    6,367,552 | 
      | 
      | 
    $ | 
    314,462 | 
      | 
      | 
    $ | 
    6,682,014 | 
      | 
 
  
    | Services transferred over time | 
      | 
      | 
    1,565,136 | 
      | 
      | 
      | 
    2,176,385 | 
      | 
      | 
      | 
    3,741,521 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Revenues | 
      | 
    $ | 
    7,932,688 | 
      | 
      | 
    $ | 
    2,490,847 | 
      | 
      | 
    $ | 
    10,423,535 | 
      | 
 
   
  
  
    |   | 
      | 
    For the Six Months Ended April 30, 2020 | 
      | 
 
  
    |   | 
      | 
    Marine | 
      | 
      | 
    Marine | 
      | 
      | 
      | 
      | 
 
  
    |   | 
      | 
    Technology | 
      | 
      | 
    Engineering | 
      | 
      | 
    Grand | 
      | 
 
  
    |   | 
      | 
    Business | 
      | 
      | 
    Business | 
      | 
      | 
    Total | 
      | 
 
  
    | Disaggregation of Total Net Sales | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Primary Geographical Markets | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Americas | 
      | 
    $ | 
    1,054,970 | 
      | 
      | 
    $ | 
    3,146,013 | 
      | 
      | 
    $ | 
    4,200,983 | 
      | 
 
  
    | Europe | 
      | 
      | 
    1,139,007 | 
      | 
      | 
      | 
    1,500,173 | 
      | 
      | 
      | 
    2,639,180 | 
      | 
 
  
    | Australia/Asia | 
      | 
      | 
    3,041,746 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    3,041,746 | 
      | 
 
  
    | Middle East/Africa | 
      | 
      | 
    88,288 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    88,288 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Revenues | 
      | 
    $ | 
    5,324,011 | 
      | 
      | 
    $ | 
    4,646,186 | 
      | 
      | 
    $ | 
    9,970,197 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Major Goods/Service Lines | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Equipment Sales | 
      | 
    $ | 
    3,205,777 | 
      | 
      | 
    $ | 
    - | 
      | 
      | 
    $ | 
    3,205,777 | 
      | 
 
  
    | Equipment Rentals | 
      | 
      | 
    828,564 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    828,564 | 
      | 
 
  
    | Software Sales | 
      | 
      | 
    245,521 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    245,521 | 
      | 
 
  
    | Engineering Parts | 
      | 
      | 
    - | 
      | 
      | 
      | 
    3,988,363 | 
      | 
      | 
      | 
    3,988,363 | 
      | 
 
  
    | Services | 
      | 
      | 
    1,044,149 | 
      | 
      | 
      | 
    657,823 | 
      | 
      | 
      | 
    1,701,972 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Revenues | 
      | 
    $ | 
    5,324,011 | 
      | 
      | 
    $ | 
    4,646,186 | 
      | 
      | 
    $ | 
    9,970,197 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Goods transferred at a point in time | 
      | 
    $ | 
    3,319,289 | 
      | 
      | 
    $ | 
    - | 
      | 
      | 
    $ | 
    3,319,289 | 
      | 
 
  
    | Services transferred over time | 
      | 
      | 
    2,004,722 | 
      | 
      | 
      | 
    4,646,186 | 
      | 
      | 
      | 
    6,650,908 | 
      | 
 
  
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
  
    | Total Revenues | 
      | 
    $ | 
    5,324,011 | 
      | 
      | 
    $ | 
    4,646,186 | 
      | 
      | 
    $ | 
    9,970,197 | 
      | 
 
   
 |