| Schedule of Segment Reporting Information | 
 Information concerning principal
geographic areas is presented below according to the area where the activity has taken place for the three months ended April 30,
2018 and 2017 respectively: 
  
  
    |   | 
      | 
    Marine Technology Business (Products) | 
      | 
      | 
    Marine Engineering Business (Services) | 
      | 
      | 
    Overhead | 
      | 
      | 
    Total | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Three Months Ended April 30, 2018 | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Revenues from External Customers | 
      | 
    $ | 
    2,173,291 | 
      | 
      | 
    $ | 
    1,353,105 | 
      | 
      | 
    $ | 
    - | 
      | 
      | 
    $ | 
    3,526,396 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Cost of Revenues | 
      | 
      | 
    217,222 | 
      | 
      | 
      | 
    723,636 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    940,858 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Gross Profit | 
      | 
      | 
    1,956,069 | 
      | 
      | 
      | 
    629,469 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    2,585,538 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Research & Development | 
      | 
      | 
    503,518 | 
      | 
      | 
      | 
    136,959 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    640,477 | 
      | 
 
    | Selling, General & Administrative | 
      | 
      | 
    850,521 | 
      | 
      | 
      | 
    614,718 | 
      | 
      | 
      | 
    560,391 | 
      | 
      | 
      | 
    2,025,630 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total Operating Expenses | 
      | 
      | 
    1,354,039 | 
      | 
      | 
      | 
    751,677 | 
      | 
      | 
      | 
    560,391 | 
      | 
      | 
      | 
    2,666,107 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Operating Income (Loss) | 
      | 
      | 
    602,030 | 
      | 
      | 
      | 
    (122,208 | 
    ) | 
      | 
      | 
    (560,391 | 
    ) | 
      | 
      | 
    (80,569 | 
    ) | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Other Income (Expense) | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Other Income | 
      | 
      | 
    81,918 | 
      | 
      | 
      | 
    2,097 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    84,015 | 
      | 
 
    | Interest Expense | 
      | 
      | 
    (2,385 | 
    ) | 
      | 
      | 
    (14,752 | 
    ) | 
      | 
      | 
    (63,604 | 
    ) | 
      | 
      | 
    (80,741 | 
    ) | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total other income (expense) | 
      | 
      | 
    79,533 | 
      | 
      | 
      | 
    (12,655 | 
    ) | 
      | 
      | 
    (63,604 | 
    ) | 
      | 
      | 
    3,274 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Income (Loss) before income taxes | 
      | 
      | 
    681,563 | 
      | 
      | 
      | 
    (134,863 | 
    ) | 
      | 
      | 
    (623,995 | 
    ) | 
      | 
      | 
    (77,295 | 
    ) | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Income tax benefit (expense) | 
      | 
      | 
    (6,431 | 
    ) | 
      | 
      | 
    - | 
      | 
      | 
      | 
    6,401 | 
      | 
      | 
      | 
    (30 | 
    ) | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Net Income (Loss) | 
      | 
    $ | 
    675,132 | 
      | 
      | 
    $ | 
    (134,863 | 
    ) | 
      | 
    $ | 
    (617,594 | 
    ) | 
      | 
    $ | 
    (77,325 | 
    ) | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Supplemental Disclosures | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total Assets | 
      | 
    $ | 
    12,655,196 | 
      | 
      | 
    $ | 
    10,944,045 | 
      | 
      | 
    $ | 
    342,932 | 
      | 
      | 
    $ | 
    23,942,173 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total Liabilities | 
      | 
      | 
    763,339 | 
      | 
      | 
      | 
    1,435,771 | 
      | 
      | 
      | 
    1,938,490 | 
      | 
      | 
      | 
    4,137,600 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Revenues from Intercompany Sales - eliminated from sales above | 
      | 
      | 
    315,954 | 
      | 
      | 
      | 
    132,837 | 
      | 
      | 
      | 
    675,000 | 
      | 
      | 
      | 
    1,123,791 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Depreciation and Amortization | 
      | 
      | 
    113,923 | 
      | 
      | 
      | 
    72,499 | 
      | 
      | 
      | 
    4,255 | 
      | 
      | 
      | 
    190,677 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Purchases of Long-lived Assets | 
      | 
      | 
    52,112 | 
      | 
      | 
      | 
    6,056 | 
      | 
      | 
      | 
    24,785 | 
      | 
      | 
      | 
    82,953 | 
      | 
 
 
  
  
    |   | 
      | 
    
Marine 
Technology 
Business 
(Products)
 | 
      | 
      | 
    
Marine 
Engineering 
Business 
(Services)
 | 
      | 
      | 
    Overhead | 
      | 
      | 
    Total | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Three Months Ended April 30, 2017 | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Revenues from External Customers | 
      | 
    $ | 
    3,299,545 | 
      | 
      | 
    $ | 
    1,979,213 | 
      | 
      | 
    $ | 
    - | 
      | 
      | 
    $ | 
    5,278,758 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Cost of Revenues | 
      | 
      | 
    968,908 | 
      | 
      | 
      | 
    1,045,032 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    2,013,940 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Gross Profit | 
      | 
      | 
    2,330,637 | 
      | 
      | 
      | 
    934,181 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    3,264,818 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Research & Development | 
      | 
      | 
    247,758 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    247,758 | 
      | 
 
    | Selling, General & Administrative | 
      | 
      | 
    830,121 | 
      | 
      | 
      | 
    655,560 | 
      | 
      | 
      | 
    154,211 | 
      | 
      | 
      | 
    1,639,892 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total Operating Expenses | 
      | 
      | 
    1,077,879 | 
      | 
      | 
      | 
    655,560 | 
      | 
      | 
      | 
    154,211 | 
      | 
      | 
      | 
    1,887,650 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Operating Income (Loss) | 
      | 
      | 
    1,252,758 | 
      | 
      | 
      | 
    278,621 | 
      | 
      | 
      | 
    (154,211 | 
    ) | 
      | 
      | 
    1,377,168 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Other Income (Expense) | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Other Income | 
      | 
      | 
    86,643 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    86,643 | 
      | 
 
    | Interest Expense | 
      | 
      | 
    (181,806 | 
    ) | 
      | 
      | 
    (75,001 | 
    ) | 
      | 
      | 
    67,960 | 
      | 
      | 
      | 
    (188,847 | 
    ) | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total other income (expense) | 
      | 
      | 
    (95,163 | 
    ) | 
      | 
      | 
    (75,001 | 
    ) | 
      | 
      | 
    67,960 | 
      | 
      | 
      | 
    (102,204 | 
    ) | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Income (Loss) before income taxes | 
      | 
      | 
    1,157,595 | 
      | 
      | 
      | 
    203,620 | 
      | 
      | 
      | 
    (86,251 | 
    ) | 
      | 
      | 
    1,274,964 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Income tax benefit (expense) | 
      | 
      | 
    - | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    - | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Net Income (Loss) | 
      | 
    $ | 
    1,157,595 | 
      | 
      | 
    $ | 
    203,620 | 
      | 
      | 
    $ | 
    (86,251 | 
    ) | 
      | 
    $ | 
    1,274,964 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Supplemental Disclosures | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total Assets | 
      | 
    $ | 
    12,119,417 | 
      | 
      | 
    $ | 
    12,616,569 | 
      | 
      | 
    $ | 
    422,059 | 
      | 
      | 
    $ | 
    25,158,045 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total Liabilities | 
      | 
      | 
    1,223,741 | 
      | 
      | 
      | 
    1,654,104 | 
      | 
      | 
      | 
    8,600,374 | 
      | 
      | 
      | 
    11,478,219 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Revenues from Intercompany Sales - eliminated from sales above | 
      | 
      | 
    505,660 | 
      | 
      | 
      | 
    170,056 | 
      | 
      | 
      | 
    118,875 | 
      | 
      | 
      | 
    794,591 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Depreciation and Amortization | 
      | 
      | 
    145,800 | 
      | 
      | 
      | 
    71,056 | 
      | 
      | 
      | 
    3,106 | 
      | 
      | 
      | 
    219,962 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Purchases of Long-lived Assets | 
      | 
      | 
    643,603 | 
      | 
      | 
      | 
    26,852 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    670,455 | 
      | 
 
 
  
    |   | 
      | 
    Marine Technology Business (Products) | 
      | 
      | 
    Marine Engineering Business (Services) | 
      | 
      | 
    Overhead | 
      | 
      | 
    Total | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Six Months Ended April 30, 2018 | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Revenues from External Customers | 
      | 
    $ | 
    4,216,233 | 
      | 
      | 
    $ | 
    2,360,720 | 
      | 
      | 
    $ | 
    - | 
      | 
      | 
    $ | 
    6,576,953 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Cost of Revenues | 
      | 
      | 
    647,353 | 
      | 
      | 
      | 
    1,239,612 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    1,886,965 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Gross Profit | 
      | 
      | 
    3,568,880 | 
      | 
      | 
      | 
    1,121,108 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    4,689,988 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Research & Development | 
      | 
      | 
    945,792 | 
      | 
      | 
      | 
    365,224 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    1,311,016 | 
      | 
 
    | Selling, General & Administrative | 
      | 
      | 
    1,428,086 | 
      | 
      | 
      | 
    1,245,592 | 
      | 
      | 
      | 
    857,709 | 
      | 
      | 
      | 
    3,531,387 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total Operating Expenses | 
      | 
      | 
    2,373,878 | 
      | 
      | 
      | 
    1,610,816 | 
      | 
      | 
      | 
    857,709 | 
      | 
      | 
      | 
    4,842,403 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Operating Income (Loss) | 
      | 
      | 
    1,195,002 | 
      | 
      | 
      | 
    (489,708 | 
    ) | 
      | 
      | 
    (857,709 | 
    ) | 
      | 
      | 
    (152,415 | 
    ) | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Other Income (Expense) | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Other Income | 
      | 
      | 
    88,573 | 
      | 
      | 
      | 
    2,097 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    90,670 | 
      | 
 
    | Interest (Expense) Income | 
      | 
      | 
    (6,804 | 
    ) | 
      | 
      | 
    (29,701 | 
    ) | 
      | 
      | 
    (146,984 | 
    ) | 
      | 
      | 
    (183,489 | 
    ) | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total other income (expense) | 
      | 
      | 
    81,769 | 
      | 
      | 
      | 
    (27,604 | 
    ) | 
      | 
      | 
    (146,984 | 
    ) | 
      | 
      | 
    (92,819 | 
    ) | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Income (Loss) before income taxes | 
      | 
      | 
    1,276,771 | 
      | 
      | 
      | 
    (517,312 | 
    ) | 
      | 
      | 
    (1,004,693 | 
    ) | 
      | 
      | 
    (245,234 | 
    ) | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Income tax benefit (expense) | 
      | 
      | 
    (6,596 | 
    ) | 
      | 
      | 
    - | 
      | 
      | 
      | 
    6,566 | 
      | 
      | 
      | 
    (30 | 
    ) | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Net Income (Loss) | 
      | 
    $ | 
    1,270,175 | 
      | 
      | 
    $ | 
    (517,312 | 
    ) | 
      | 
    $ | 
    (998,127 | 
    ) | 
      | 
    $ | 
    (245,264 | 
    ) | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Supplemental Disclosures | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total Assets | 
      | 
    $ | 
    12,455,194 | 
      | 
      | 
    $ | 
    10,944,045 | 
      | 
      | 
    $ | 
    342,932 | 
      | 
      | 
    $ | 
    23,942,173 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total Liabilities | 
      | 
      | 
    760,320 | 
      | 
      | 
      | 
    1,438,790 | 
      | 
      | 
      | 
    1,938,490 | 
      | 
      | 
      | 
    4,137,600 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Revenues from Intercompany Sales - eliminated from sales above | 
      | 
      | 
    471,218 | 
      | 
      | 
      | 
    10,189 | 
      | 
      | 
      | 
    675,000 | 
      | 
      | 
      | 
    1,156,407 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Depreciation and Amortization | 
      | 
      | 
    236,650 | 
      | 
      | 
      | 
    152,214 | 
      | 
      | 
      | 
    7,192 | 
      | 
      | 
      | 
    396,056 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Purchases of Long-lived Assets | 
      | 
      | 
    254,029 | 
      | 
      | 
      | 
    49,961 | 
      | 
      | 
      | 
    24,785 | 
      | 
      | 
      | 
    328,775 | 
      | 
 
 
  
    |   | 
      | 
    Marine Technology Business (Products) | 
      | 
      | 
    Marine Engineering Business (Services) | 
      | 
      | 
    Overhead | 
      | 
      | 
    Total | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Six Months Ended April 30, 2017 | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Revenues from External Customers | 
      | 
    $ | 
    5,750,144 | 
      | 
      | 
    $ | 
    4,886,817 | 
      | 
      | 
    $ | 
    - | 
      | 
      | 
    $ | 
    10,636,961 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Cost of Revenues | 
      | 
      | 
    1,698,926 | 
      | 
      | 
      | 
    2,298,059 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    3,996,985 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Gross Profit | 
      | 
      | 
    4,051,218 | 
      | 
      | 
      | 
    2,588,758 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    6,639,976 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Research & Development | 
      | 
      | 
    498,988 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    498,988 | 
      | 
 
    | Selling, General & Administrative | 
      | 
      | 
    1,404,770 | 
      | 
      | 
      | 
    1,341,971 | 
      | 
      | 
      | 
    299,039 | 
      | 
      | 
      | 
    3,045,780 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total Operating Expenses | 
      | 
      | 
    1,903,758 | 
      | 
      | 
      | 
    1,341,971 | 
      | 
      | 
      | 
    299,039 | 
      | 
      | 
      | 
    3,544,768 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Operating Income (Loss) | 
      | 
      | 
    2,147,460 | 
      | 
      | 
      | 
    1,246,787 | 
      | 
      | 
      | 
    (299,039 | 
    ) | 
      | 
      | 
    3,095,208 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Other Income (Expense) | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Other Income | 
      | 
      | 
    136,059 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    136,059 | 
      | 
 
    | Interest Expense | 
      | 
      | 
    (532,141 | 
    ) | 
      | 
      | 
    (199,223 | 
    ) | 
      | 
      | 
    347,023 | 
      | 
      | 
      | 
    (384,341 | 
    ) | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total other income (expense) | 
      | 
      | 
    (396,082 | 
    ) | 
      | 
      | 
    (199,223 | 
    ) | 
      | 
      | 
    347,023 | 
      | 
      | 
      | 
    (248,282 | 
    ) | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Income before income taxes | 
      | 
      | 
    1,751,378 | 
      | 
      | 
      | 
    1,047,564 | 
      | 
      | 
      | 
    47,984 | 
      | 
      | 
      | 
    2,846,926 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Income tax benefit (expense) | 
      | 
      | 
    - | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    - | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Net Income | 
      | 
    $ | 
    1,751,378 | 
      | 
      | 
    $ | 
    1,047,564 | 
      | 
      | 
    $ | 
    47,984 | 
      | 
      | 
    $ | 
    2,846,926 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Supplemental Disclosures | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total Assets | 
      | 
    $ | 
    12,119,417 | 
      | 
      | 
    $ | 
    12,616,569 | 
      | 
      | 
    $ | 
    422,059 | 
      | 
      | 
    $ | 
    25,158,045 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total Liabilities | 
      | 
      | 
    1,223,741 | 
      | 
      | 
      | 
    1,654,104 | 
      | 
      | 
      | 
    8,600,374 | 
      | 
      | 
      | 
    11,478,219 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Revenues from Intercompany Sales - eliminated from sales above | 
      | 
      | 
    678,513 | 
      | 
      | 
      | 
    229,955 | 
      | 
      | 
      | 
    237,750 | 
      | 
      | 
      | 
    1,146,218 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Depreciation and Amortization | 
      | 
      | 
    247,263 | 
      | 
      | 
      | 
    142,781 | 
      | 
      | 
      | 
    6,317 | 
      | 
      | 
      | 
    396,361 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Purchases of Long-lived Assets | 
      | 
      | 
    2,289,063 | 
      | 
      | 
      | 
    49,033 | 
      | 
      | 
      | 
    12,470 | 
      | 
      | 
      | 
    2,350,566 | 
      | 
 
 
  
    |   | 
      | 
    USA | 
      | 
      | 
    Europe | 
      | 
      | 
    Australia | 
      | 
      | 
    Total | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | External Revenues by Geographic Locations | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Three Months Ended April 30, 2018 | 
      | 
    $ | 
    1,934,365 | 
      | 
      | 
    $ | 
    1,476,668 | 
      | 
      | 
    $ | 
    115,363 | 
      | 
      | 
    $ | 
    3,526,396 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Three Months Ended April 30, 2017 | 
      | 
    $ | 
    2,525,908 | 
      | 
      | 
    $ | 
    2,614,897 | 
      | 
      | 
    $ | 
    137,953 | 
      | 
      | 
    $ | 
    5,278,758 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Six Months Ended April 30, 2018 | 
      | 
    $ | 
    3,021,991 | 
      | 
      | 
    $ | 
    3,298,704 | 
      | 
      | 
    $ | 
    256,258 | 
      | 
      | 
    $ | 
    6,576,953 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Six Months Ended April 30, 2017 | 
      | 
    $ | 
    5,275,675 | 
      | 
      | 
    $ | 
    4,631,934 | 
      | 
      | 
    $ | 
    729,352 | 
      | 
      | 
    $ | 
    10,636,961 | 
      | 
 
 
 |