| 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 January
31, 2018 and 2017 respectively: 
  
    |   | 
      | 
    Marine Technology Business (Products) | 
      | 
      | 
    Marine Engineering Business (Services) | 
      | 
      | 
    Overhead | 
      | 
      | 
    Total | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Three Months Ended January 31, 2018 | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Revenues from External Customers | 
      | 
    $ | 
    2,042,942 | 
      | 
      | 
    $ | 
    1,007,615 | 
      | 
      | 
    $ | 
    - | 
      | 
      | 
    $ | 
    3,050,557 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Cost of Revenues | 
      | 
      | 
    430,131 | 
      | 
      | 
      | 
    515,976 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    946,107 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Gross Profit | 
      | 
      | 
    1,612,811 | 
      | 
      | 
      | 
    491,639 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    2,104,450 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Research & Development | 
      | 
      | 
    442,274 | 
      | 
      | 
      | 
    228,265 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    670,539 | 
      | 
 
    | Selling, General & Administrative | 
      | 
      | 
    577,565 | 
      | 
      | 
      | 
    630,874 | 
      | 
      | 
      | 
    297,318 | 
      | 
      | 
      | 
    1,505,757 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total Operating Expenses | 
      | 
      | 
    1,019,839 | 
      | 
      | 
      | 
    859,139 | 
      | 
      | 
      | 
    297,318 | 
      | 
      | 
      | 
    2,176,296 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Operating Income (Loss) | 
      | 
      | 
    592,972 | 
      | 
      | 
      | 
    (367,500 | 
    ) | 
      | 
      | 
    (297,318 | 
    ) | 
      | 
      | 
    (71,846 | 
    ) | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Other Income (Expense) | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Other Income | 
      | 
      | 
    6,655 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    6,655 | 
      | 
 
    | Interest (Expense) | 
      | 
      | 
    (4,419 | 
    ) | 
      | 
      | 
    (14,949 | 
    ) | 
      | 
      | 
    (83,380 | 
    ) | 
      | 
      | 
    (102,748 | 
    ) | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total other income (expense) | 
      | 
      | 
    2,236 | 
      | 
      | 
      | 
    (14,949 | 
    ) | 
      | 
      | 
    (83,380 | 
    ) | 
      | 
      | 
    (96,093 | 
    ) | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Income (Loss) before income taxes | 
      | 
      | 
    595,208 | 
      | 
      | 
      | 
    (382,449 | 
    ) | 
      | 
      | 
    (380,698 | 
    ) | 
      | 
      | 
    (167,939 | 
    ) | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Income tax benefit (expense) | 
      | 
      | 
    - | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    - | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Net Income (Loss) | 
      | 
    $ | 
    595,208 | 
      | 
      | 
    $ | 
    (382,449 | 
    ) | 
      | 
    $ | 
    (380,698 | 
    ) | 
      | 
    $ | 
    (167,939 | 
    ) | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Supplemental Disclosures | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total Assets | 
      | 
    $ | 
    12,419,192 | 
      | 
      | 
    $ | 
    11,095,135 | 
      | 
      | 
    $ | 
    5,449,334 | 
      | 
      | 
    $ | 
    28,963,661 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total Liabilities | 
      | 
      | 
    862,542 | 
      | 
      | 
      | 
    1,405,271 | 
      | 
      | 
      | 
    7,126,250 | 
      | 
      | 
      | 
    9,394,063 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Revenues from Intercompany Sales - eliminated from sales above | 
      | 
      | 
    471,218 | 
      | 
      | 
      | 
    10,189 | 
      | 
      | 
      | 
    675,000 | 
      | 
      | 
      | 
    1,156,407 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Depreciation and Amortization | 
      | 
      | 
    137,518 | 
      | 
      | 
      | 
    79,715 | 
      | 
      | 
      | 
    2,937 | 
      | 
      | 
      | 
    220,170 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Purchases of Long-lived Assets | 
      | 
      | 
    201,917 | 
      | 
      | 
      | 
    43,905 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    245,822 | 
      | 
 
 
 
 
    |   | 
      | 
    Marine Technology Business (Products) | 
      | 
      | 
    Marine Engineering Business (Services) | 
      | 
      | 
    Overhead | 
      | 
      | 
    Total | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Three Months Ended January 31, 2017 | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Revenues from External Customers | 
      | 
    $ | 
    2,450,599 | 
      | 
      | 
    $ | 
    2,907,604 | 
      | 
      | 
    $ | 
    - | 
      | 
      | 
    $ | 
    5,358,203 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Cost of Revenues | 
      | 
      | 
    730,021 | 
      | 
      | 
      | 
    1,253,025 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    1,983,046 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Gross Profit | 
      | 
      | 
    1,720,578 | 
      | 
      | 
      | 
    1,654,579 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    3,375,157 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Research & Development | 
      | 
      | 
    251,230 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    251,230 | 
      | 
 
    | Selling, General & Administrative | 
      | 
      | 
    574,648 | 
      | 
      | 
      | 
    686,411 | 
      | 
      | 
      | 
    144,829 | 
      | 
      | 
      | 
    1,405,888 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total Operating Expenses | 
      | 
      | 
    825,878 | 
      | 
      | 
      | 
    686,411 | 
      | 
      | 
      | 
    144,829 | 
      | 
      | 
      | 
    1,657,118 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Operating Income (Loss) | 
      | 
      | 
    894,700 | 
      | 
      | 
      | 
    968,168 | 
      | 
      | 
      | 
    (144,829 | 
    ) | 
      | 
      | 
    1,718,039 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Other Income (Expense) | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Other Income | 
      | 
      | 
    49,416 | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    49,416 | 
      | 
 
    | Interest (Expense) | 
      | 
      | 
    (350,334 | 
    ) | 
      | 
      | 
    (124,221 | 
    ) | 
      | 
      | 
    279,061 | 
      | 
      | 
      | 
    (195,494 | 
    ) | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total other income (expense) | 
      | 
      | 
    (300,918 | 
    ) | 
      | 
      | 
    (124,221 | 
    ) | 
      | 
      | 
    279,061 | 
      | 
      | 
      | 
    (146,078 | 
    ) | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Income before income taxes | 
      | 
      | 
    593,782 | 
      | 
      | 
      | 
    843,947 | 
      | 
      | 
      | 
    134,232 | 
      | 
      | 
      | 
    1,571,961 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Income tax benefit (expense) | 
      | 
      | 
    - | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    - | 
      | 
      | 
      | 
    - | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Net Income  | 
      | 
    $ | 
    593,782 | 
      | 
      | 
    $ | 
    843,947 | 
      | 
      | 
    $ | 
    134,232 | 
      | 
      | 
    $ | 
    1,571,961 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Supplemental Disclosures | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total Assets | 
      | 
    $ | 
    10,586,262 | 
      | 
      | 
    $ | 
    12,249,349 | 
      | 
      | 
    $ | 
    506,050 | 
      | 
      | 
    $ | 
    23,341,661 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Total Liabilities | 
      | 
      | 
    843,107 | 
      | 
      | 
      | 
    1,716,788 | 
      | 
      | 
      | 
    9,723,632 | 
      | 
      | 
      | 
    12,283,527 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Revenues from Intercompany Sales - eliminated from sales above | 
      | 
      | 
    172,853 | 
      | 
      | 
      | 
    59,899 | 
      | 
      | 
      | 
    118,875 | 
      | 
      | 
      | 
    351,627 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Depreciation and Amortization | 
      | 
      | 
    101,463 | 
      | 
      | 
      | 
    71,725 | 
      | 
      | 
      | 
    3,211 | 
      | 
      | 
      | 
    176,399 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Purchases of Long-lived Assets | 
      | 
      | 
    1,645,460 | 
      | 
      | 
      | 
    22,181 | 
      | 
      | 
      | 
    12,470 | 
      | 
      | 
      | 
    1,680,111 | 
      | 
 
 
  
    |   | 
      | 
    USA | 
      | 
      | 
    Europe | 
      | 
      | 
    Australia | 
      | 
      | 
    Total | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | External Revenues by Geographic Locations | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Three Months Ended January 31, 2018 | 
      | 
    $ | 
    1,087,626 | 
      | 
      | 
    $ | 
    1,822,036 | 
      | 
      | 
    $ | 
    140,895 | 
      | 
      | 
    $ | 
    3,050,557 | 
      | 
 
    |   | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
      | 
 
    | Three Months Ended January 31, 2017 | 
      | 
    $ | 
    2,749,768 | 
      | 
      | 
    $ | 
    2,017,036 | 
      | 
      | 
    $ | 
    591,399 | 
      | 
      | 
    $ | 
    5,358,203 | 
     | 
 
 
 |