| Schedule of Segment Reporting Information | 
    |   | 
      | 
    Marine Technology Business (Products) | 
      | 
      | 
    Marine Engineering Business (Services) | 
      | 
      | 
    Overhead | 
      | 
      | 
    Total | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Three Months Ended July 31, 2017 | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Revenues from External Customers | 
      | 
    $ | 
    3,439,587 | 
      | 
      | 
    $ | 
    1,604,003 | 
      | 
      | 
    $ | 
    - | 
      | 
      | 
    $ | 
    5,043,590 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Cost of Revenues | 
      | 
      | 
    1,054,369 | 
      | 
      | 
      | 
    928,392 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    1,982,761 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Gross Profit | 
      | 
      | 
    2,385,218 | 
      | 
      | 
      | 
    675,611 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    3,060,829 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Research & Development | 
      | 
      | 
    200,118 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    200,118 | 
      | 
 
    | Selling, General & Administrative | 
      | 
      | 
    781,908 | 
      | 
      | 
      | 
    637,465 | 
      | 
      | 
      | 
    297,891 | 
      | 
      | 
      | 
    1,717,264 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total Operating Expenses | 
      | 
      | 
    982,026 | 
      | 
      | 
      | 
    637,465 | 
      | 
      | 
      | 
    297,891 | 
      | 
      | 
      | 
    1,917,382 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Operating Income (Loss) | 
      | 
      | 
    1,403,192 | 
      | 
      | 
      | 
    38,146 | 
      | 
      | 
      | 
    (297,891 | 
    ) | 
      | 
      | 
    1,143,447 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Other Income (Expense) | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Other Income | 
      | 
      | 
    89,670 | 
      | 
      | 
      | 
    261 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    89,931 | 
      | 
 
    | Interest Expense | 
      | 
      | 
    (5,947 | 
    ) | 
      | 
      | 
    (15,451 | 
    ) | 
      | 
      | 
    (90,691 | 
    ) | 
      | 
      | 
    (112,089 | 
    ) | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total other income (expense) | 
      | 
      | 
    83,723 | 
      | 
      | 
      | 
    (15,190 | 
    ) | 
      | 
      | 
    (90,691 | 
    ) | 
      | 
      | 
    (22,158) | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Income before income taxes | 
      | 
      | 
    1,486,915 | 
      | 
      | 
      | 
    22,956 | 
      | 
      | 
      | 
    (388,582 | 
    ) | 
      | 
      | 
    1,121,289 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Income tax benefit (expense) | 
      | 
      | 
    3,513 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    3,513 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Net Income | 
      | 
    $ | 
    1,490,428 | 
      | 
      | 
    $ | 
    22,956 | 
      | 
      | 
    $ | 
    (388,582 | 
    ) | 
      | 
    $ | 
    1,124,802 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Supplemental Disclosures | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total Assets | 
      | 
    $ | 
    12,300,376 | 
      | 
      | 
    $ | 
    12,529,169 | 
      | 
      | 
    $ | 
    1,093,219 | 
      | 
      | 
    $ | 
    25,922,764 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total Liabilities | 
      | 
      | 
    1,103,023 | 
      | 
      | 
      | 
    1,638,002 | 
      | 
      | 
      | 
    8,287,374 | 
      | 
      | 
      | 
    11,028,399 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Revenues from Intercompany Sales - eliminated from sales above | 
      | 
      | 
    1,002,339 | 
      | 
      | 
      | 
    36,030 | 
      | 
      | 
      | 
    369,625 | 
      | 
      | 
      | 
    1,407,994 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Depreciation and Amortization | 
      | 
      | 
    130,048 | 
      | 
      | 
      | 
    101,442 | 
      | 
      | 
      | 
    3,211 | 
      | 
      | 
      | 
    234,701 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Purchases of Long-lived Assets | 
      | 
      | 
    252,653 | 
      | 
      | 
      | 
    45,841 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    298,494 | 
      | 
 
 
  
    |   | 
      | 
    Marine Technology Business (Products) | 
      | 
      | 
    Marine Engineering Business (Services) | 
      | 
      | 
    Overhead | 
      | 
      | 
    Total | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Three Months Ended July 31, 2016 | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Revenues from External Customers | 
      | 
    $ | 
    2,427,570 | 
      | 
      | 
    $ | 
    1,851,090 | 
      | 
      | 
    $ | 
    - | 
      | 
      | 
    $ | 
    4,278,660 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Cost of Revenues | 
      | 
      | 
    622,195 | 
      | 
      | 
      | 
    810,478 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    1,432,673 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Gross Profit | 
      | 
      | 
    1,805,375 | 
      | 
      | 
      | 
    1,040,612 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    2,845,987 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Research & Development | 
      | 
      | 
    292,855 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    292,855 | 
      | 
 
    | Selling, General & Administrative | 
      | 
      | 
    422,096 | 
      | 
      | 
      | 
    578,297 | 
      | 
      | 
      | 
    284,523 | 
      | 
      | 
      | 
    1,284,916 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total Operating Expenses | 
      | 
      | 
    714,951 | 
      | 
      | 
      | 
    578,297 | 
      | 
      | 
      | 
    284,523 | 
      | 
      | 
      | 
    1,577,771 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Operating Income (Loss) | 
      | 
      | 
    1,090,424 | 
      | 
      | 
      | 
    462,315 | 
      | 
      | 
      | 
    (284,523 | 
    ) | 
      | 
      | 
    1,268,216 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Other Income (Expense) | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Other Income | 
      | 
      | 
    50,226 | 
      | 
      | 
      | 
    (111 | 
    ) | 
      | 
      | 
    - | 
      | 
      | 
      | 
    50,115 | 
      | 
 
    | Interest Expense | 
      | 
      | 
    (330,306 | 
    ) | 
      | 
      | 
    (110,113 | 
    ) | 
      | 
      | 
    222,948 | 
      | 
      | 
      | 
    (217,471 | 
    ) | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total other income (expense) | 
      | 
      | 
    (280,080 | 
    ) | 
      | 
      | 
    (110,224 | 
    ) | 
      | 
      | 
    222,948 | 
      | 
      | 
      | 
    (167,356 | 
    ) | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Income (Loss) before income taxes | 
      | 
      | 
    810,344 | 
      | 
      | 
      | 
    352,091 | 
      | 
      | 
      | 
    (61,575 | 
    ) | 
      | 
      | 
    1,100,860 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Income tax benefit (expense) | 
      | 
      | 
    - | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    - | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Net Income (Loss) | 
      | 
    $ | 
    810,344 | 
      | 
      | 
    $ | 
    352,091 | 
      | 
      | 
    $ | 
    (61,575 | 
    ) | 
      | 
    $ | 
    1,100,860 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Supplemental Disclosures | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total Assets | 
      | 
    $ | 
    11,883,612 | 
      | 
      | 
    $ | 
    9,613,958 | 
      | 
      | 
    $ | 
    155,302 | 
      | 
      | 
    $ | 
    21,652,872 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total Liabilities | 
      | 
      | 
    1,218,381 | 
      | 
      | 
      | 
    640,083 | 
      | 
      | 
      | 
    10,808,862 | 
      | 
      | 
      | 
    12,667,326 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Revenues from Intercompany Sales - eliminated from sales above | 
      | 
      | 
    286,892 | 
      | 
      | 
      | 
    (63,221 | 
    ) | 
      | 
      | 
    118,875 | 
      | 
      | 
      | 
    342,546 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Depreciation and Amortization | 
      | 
      | 
    121,600 | 
      | 
      | 
      | 
    81,129 | 
      | 
      | 
      | 
    3,199 | 
      | 
      | 
      | 
    205,928 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Purchases of Long-lived Assets | 
      | 
      | 
    (76,401 | 
    ) | 
      | 
      | 
    (8,648 | 
    ) | 
      | 
      | 
    3,600 | 
      | 
      | 
      | 
    (81,449 | 
    ) | 
 
 
   
    |   | 
      | 
    Marine Technology Business (Products) | 
      | 
      | 
    Marine Engineering Business (Services) | 
      | 
      | 
    Overhead | 
      | 
      | 
    Total | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Nine Months Ended July 31, 2017 | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Revenues from External Customers | 
      | 
    $ | 
    9,189,731 | 
      | 
      | 
    $ | 
    6,490,820 | 
      | 
      | 
    $ | 
    - | 
      | 
      | 
    $ | 
    15,680,551 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Cost of Revenues | 
      | 
      | 
    2,753,297 | 
      | 
      | 
      | 
    3,226,449 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    5,979,746 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Gross Profit | 
      | 
      | 
    6,436,434 | 
      | 
      | 
      | 
    3,264,371 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    9,700,805 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Research & Development | 
      | 
      | 
    699,106 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    699,106 | 
      | 
 
    | Selling, General & Administrative | 
      | 
      | 
    2,165,601 | 
      | 
      | 
      | 
    1,979,436 | 
      | 
      | 
      | 
    596,931 | 
      | 
      | 
      | 
    4,741,968 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total Operating Expenses | 
      | 
      | 
    2,864,707 | 
      | 
      | 
      | 
    1,979,436 | 
      | 
      | 
      | 
    596,931 | 
      | 
      | 
      | 
    5,441,074 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Operating Income (Loss) | 
      | 
      | 
    3,571,727 | 
      | 
      | 
      | 
    1,284,935 | 
      | 
      | 
      | 
    (596,931 | 
    ) | 
      | 
      | 
    4,259,731 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Other Income (Expense) | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Other Income | 
      | 
      | 
    204,653 | 
      | 
      | 
      | 
    261 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    204,914 | 
      | 
 
    | Interest (Expense) Income | 
      | 
      | 
    (538,088 | 
    ) | 
      | 
      | 
    (214,674 | 
    ) | 
      | 
      | 
    256,332 | 
      | 
      | 
      | 
    (496,430 | 
    ) | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total other income (expense) | 
      | 
      | 
    (333,435 | 
    ) | 
      | 
      | 
    (214,413 | 
    ) | 
      | 
      | 
    256,332 | 
      | 
      | 
      | 
    (291,516 | 
    ) | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Income (Loss) before income taxes | 
      | 
      | 
    3,238,292 | 
      | 
      | 
      | 
    1,070,522 | 
      | 
      | 
      | 
    (340,599 | 
    ) | 
      | 
      | 
    3,968,215 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Income tax benefit (expense) | 
      | 
      | 
    3,513 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    3,513 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Net Income | 
      | 
    $ | 
    3,241,805 | 
      | 
      | 
    $ | 
    1,070,522 | 
      | 
      | 
    $ | 
    (340,599 | 
    ) | 
      | 
    $ | 
    3,971,728 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Supplemental Disclosures | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Revenues from Intercompany Sales - eliminated from sales above | 
      | 
      | 
    1,680,852 | 
      | 
      | 
      | 
    265,985 | 
      | 
      | 
      | 
    607,375 | 
      | 
      | 
      | 
    2,554,212 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Depreciation and Amortization | 
      | 
      | 
    377,311 | 
      | 
      | 
      | 
    244,223 | 
      | 
      | 
      | 
    9,528 | 
      | 
      | 
      | 
    631,062 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Purchases of Long-lived Assets | 
      | 
      | 
    2,541,716 | 
      | 
      | 
      | 
    94,874 | 
      | 
      | 
      | 
    12,470 | 
      | 
      | 
      | 
    2,649,060 | 
      | 
 
 
  
    |   | 
      | 
    Marine Technology Business (Products) | 
      | 
      | 
    Marine Engineering Business (Services) | 
      | 
      | 
    Overhead | 
      | 
      | 
    Total | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Nine Months Ended July 31, 2016 | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Revenues from External Customers | 
      | 
    $ | 
    7,816,669 | 
      | 
      | 
    $ | 
    6,983,805 | 
      | 
      | 
    $ | 
    - | 
      | 
      | 
    $ | 
    14,800,474 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Cost of Revenues | 
      | 
      | 
    2,690,603 | 
      | 
      | 
      | 
    3,520,070 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    6,210,673 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Gross Profit | 
      | 
      | 
    5,126,066 | 
      | 
      | 
      | 
    3,463,735 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    8,589,801 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Research & Development | 
      | 
      | 
    708,146 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    708,146 | 
      | 
 
    | Selling, General & Administrative | 
      | 
      | 
    1,905,381 | 
      | 
      | 
      | 
    2,180,426 | 
      | 
      | 
      | 
    362,202 | 
      | 
      | 
      | 
    4,448,009 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total Operating Expenses | 
      | 
      | 
    2,613,527 | 
      | 
      | 
      | 
    2,180,426 | 
      | 
      | 
      | 
    362,202 | 
      | 
      | 
      | 
    5,156,155 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Operating Income (Loss) | 
      | 
      | 
    2,512,539 | 
      | 
      | 
      | 
    1,283,309 | 
      | 
      | 
      | 
    (362,202 | 
    ) | 
      | 
      | 
    3,433,646 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Other Income (Expense) | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Other Income | 
      | 
      | 
    149,990 | 
      | 
      | 
      | 
    5,787 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    155,777 | 
      | 
 
    | Interest Expense | 
      | 
      | 
    (615,383 | 
    ) | 
      | 
      | 
    (223,931 | 
    ) | 
      | 
      | 
    222,805 | 
      | 
      | 
      | 
    (616,509 | 
    ) | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total other income (expense) | 
      | 
      | 
    (465,393 | 
    ) | 
      | 
      | 
    (218,144 | 
    ) | 
      | 
      | 
    222,805 | 
      | 
      | 
      | 
    (460,732 | 
    ) | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Income (Loss) before income taxes | 
      | 
      | 
    2,047,146 | 
      | 
      | 
      | 
    1,065,165 | 
      | 
      | 
      | 
    (139,397 | 
    ) | 
      | 
      | 
    2,972,914 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Income tax benefit (expense) | 
      | 
      | 
    - | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    - | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Net Income (Loss) | 
      | 
    $ | 
    2,047,146 | 
      | 
      | 
    $ | 
    1,065,165 | 
      | 
      | 
    $ | 
    (139,397 | 
    ) | 
      | 
    $ | 
    2,972,914 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Supplemental Disclosures | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Revenues from Intercompany Sales - eliminated from sales above | 
      | 
      | 
    643,294 | 
      | 
      | 
      | 
    178,132 | 
      | 
      | 
      | 
    362,875 | 
      | 
      | 
      | 
    1,184,301 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Depreciation and Amortization | 
      | 
      | 
    247,235 | 
      | 
      | 
      | 
    255,848 | 
      | 
      | 
      | 
    9,631 | 
      | 
      | 
      | 
    512,714 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Purchases of Long-lived Assets | 
      | 
      | 
    642,906 | 
      | 
      | 
      | 
    13,150 | 
      | 
      | 
      | 
    12,468 | 
      | 
      | 
      | 
    668,524 | 
      | 
 
 
  
    |   | 
      | 
    USA | 
      | 
      | 
    Europe | 
      | 
      | 
    Australia | 
      | 
      | 
    Total | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | External Revenues by Geographic Locations | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Three Months Ended July 31, 2017 | 
      | 
    $ | 
    1,550,141 | 
      | 
      | 
    $ | 
    2,942,365 | 
      | 
      | 
    $ | 
    551,085 | 
      | 
      | 
    $ | 
    5,043,591 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Three Months Ended July 31, 2016 | 
      | 
    $ | 
    1,983,771 | 
      | 
      | 
    $ | 
    1,970,478 | 
      | 
      | 
    $ | 
    324,411 | 
      | 
      | 
    $ | 
    4,278,660 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Nine Months Ended July 31, 2017 | 
      | 
    $ | 
    6,825,815 | 
      | 
      | 
    $ | 
    7,574,299 | 
      | 
      | 
    $ | 
    1,280,437 | 
      | 
      | 
    $ | 
    15,680,551 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Nine Months Ended July 31, 2016 | 
      | 
    $ | 
    6,939,673 | 
      | 
      | 
    $ | 
    6,733,926 | 
      | 
      | 
    $ | 
    1,126,875 | 
      | 
      | 
    $ | 
    14,800,474 | 
      | 
 
 
 |