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Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Jan. 31, 2024
Accounting Policies [Abstract] |
Schedule of Cash and Cash Equivalents and Restricted Cash | The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the Consolidated Balance Sheets that total to the same amounts shown in the Consolidated Statements of Cash Flows. Schedule of Cash and Cash Equivalents and Restricted Cash
|  | January 31, 2024 |  |  | April 30, 2023 |
|  | (in thousands) |
Cash and cash equivalents |  | $ | 4,720 |  |  | $ | 6,883 |
Restricted cash- short term |  |  | 154 |  |  |  | 65 |
Restricted cash- long term |  |  | — |  |  |  | 155 |
Cash, cash equivalents, restricted cash and restricted cash equivalents |  | $ | 4,874 |  |  | $ | 7,103 |
Schedule of Investments and Unrealized Gains/Losses | The following table summarizes the Company’s short term investments as of January 31, 2024 and April 30, 2023: Schedule of Investments and Unrealized Gains/Losses
|  | January 31, 2024 |  |  | April 30, 2023 |
Category |  | Amortized Cost |  |  | Unrealized Gains |  |  | Market Value |  |  | Amortized Cost |  |  | Unrealized Gains |  |  | Market Value |
|  | (in thousands) |  |  | (in thousands) |
Corporate Bonds |  | $ | 1,767 |  |  | $ | 20 |  |  | $ | 1,787 |  |  | $ | 14,776 |  |  | $ | 100 |  |  | $ | 14,876 |
Government Bonds & Notes |  |  | 2,610 |  |  | $ | 21 |  |  |  | 2,631 |  |  |  | 9,188 |  |  | $ | 33 |  |  |  | 9,221 |
Government Agency Bonds |  |  | — |  |  | $ | — |  |  |  | — |  |  |  | 3,826 |  |  |  | 25 |  |  |  | 3,851 |
Total Short Term Investments |  | $ | 4,377 |  |  | $ | 41 |  |  | $ | 4,418 |  |  | $ | 27,790 |  |  | $ | 158 |  |  | $ | 27,948 |
Schedule of Property, Plant and Equipment, Useful Life | Schedule of Property, Plant and Equipment, Useful Life
Description |  | Estimated depreciable life
Equipment |  | 5-7 years
Computer equipment & software |  | 3 years
Office furniture & fixtures |  | 3-7 years
Leasehold improvements |  | Shorter of the estimated useful life or lease term
Leased Power Buoys assets |  | 10 years
Leased WAM-V assets |  | 10 years
Schedule of Revenue Recognizes From Operating Lease Arrangements | The below table represents the total revenue recognized under ASC 606 and ASC 842 for the three and nine months ended January 31, 2024 and 2023. Schedule of Revenue Recognizes From Operating Lease Arrangements
|  | ASC 606 |  |  | ASC 842 |  |  | Total |  |  | ASC 606 |  |  | ASC 842 |  |  | Total |
|  | Nine months ended January 31, 2024 |  |  | Nine months ended January 31, 2023 |
|  | ASC 606 |  |  | ASC 842 |  |  | Total |  |  | ASC 606 |  |  | ASC 842 |  |  | Total |
|  | (in thousands) |  |  | (in thousands) |
Product Line: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
WAM-V |  | $ | 1,625 |  |  | $ | 896 |  |  | $ | 2,521 |  |  | $ | 691 |  |  | $ | 190 |  |  | $ | 881 |
Buoy |  |  | 950 |  |  |  | — |  |  |  | 950 |  |  |  | 227 |  |  |  | — |  |  |  | 227 |
Services |  |  | 482 |  |  |  | — |  |  |  | 482 |  |  |  | 644 |  |  |  | — |  |  |  | 644 |
Total |  | $ | 3,057 |  |  | $ | 896 |  |  | $ | 3,953 |  |  | $ | 1,562 |  |  | $ | 190 |  |  | $ | 1,752 |
Region: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
North and South America |  | $ | 3,057 |  |  | $ | 896 |  |  | $ | 3,953 |  |  | $ | 1,311 |  |  | $ | 190 |  |  | $ | 1,501 |
Asia and Australia |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 251 |  |  |  | — |  |  |  | 251 |
Total |  | $ | 3,057 |  |  | $ | 896 |  |  | $ | 3,953 |  |  | $ | 1,562 |  |  | $ | 190 |  |  | $ | 1,752 |
|  | ASC 606 |  |  | ASC 842 |  |  | Total |  |  | ASC 606 |  |  | ASC 842 |  |  | Total |
|  | Three months ended January 31, 2024 |  |  | Three months ended January 31, 2023 |
|  | ASC 606 |  |  | ASC 842 |  |  | Total |  |  | ASC 606 |  |  | ASC 842 |  |  | Total |
|  | (in thousands) |  |  | (in thousands) |
Product Line: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
WAM-V |  | $ | 1,085 |  |  | $ | 387 |  |  | $ | 1,472 |  |  | $ | 271 |  |  | $ | 175 |  |  | $ | 446 |
Buoy |  |  | 320 |  |  |  | — |  |  |  | 320 |  |  |  | 176 |  |  |  | — |  |  |  | 176 |
Services |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 112 |  |  |  | — |  |  |  | 112 |
Total |  | $ | 1,405 |  |  | $ | 387 |  |  | $ | 1,792 |  |  | $ | 559 |  |  | $ | 175 |  |  | $ | 734 |
Region: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
North and South America |  | $ | 1,405 |  |  | $ | 387 |  |  | $ | 1,792 |  |  | $ | 540 |  |  | $ | 175 |  |  | $ | 715 |
Asia and Australia |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 19 |  |  |  | — |  |  |  | 19 |
Total |  | $ | 1,405 |  |  | $ | 387 |  |  | $ | 1,792 |  |  | $ | 559 |  |  | $ | 175 |  |  | $ | 734 |
Revenue |  | $ | 1,405 |  |  | $ | 387 |  |  | $ | 1,792 |  |  | $ | 559 |  |  | $ | 175 |  |  | $ | 734 |

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