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Note 3 - Revenue Recognition (Tables) | 9 Months Ended
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Dec. 31, 2025
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended December 31, 2025 |  |  | Nine Months Ended December 31, 2025 |
Product Line: |  | Grid |  |  | Wind |  |  | Grid |  |  | Wind |
Equipment and systems |  | $ | 56,004 |  |  | $ | 143 |  |  | $ | 156,300 |  |  | $ | 445 |
Services and technology development |  |  | 7,183 |  |  |  | 11,199 |  |  |  | 21,316 |  |  |  | 34,688 |
Total |  | $ | 63,187 |  |  | $ | 11,342 |  |  | $ | 177,616 |  |  | $ | 35,133 |
Region: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Americas |  | $ | 51,974 |  |  | $ | — |  |  | $ | 137,394 |  |  | $ | 16 |
Asia Pacific |  |  | 7,253 |  |  |  | 11,326 |  |  |  | 29,583 |  |  |  | 35,022 |
EMEA |  |  | 3,960 |  |  |  | 16 |  |  |  | 10,639 |  |  |  | 95 |
Total |  | $ | 63,187 |  |  | $ | 11,342 |  |  | $ | 177,616 |  |  | $ | 35,133 |
|  | Three Months Ended December 31, 2024 |  |  | Nine Months Ended December 31, 2024 |
Product Line: |  | Grid |  |  | Wind |  |  | Grid |  |  | Wind |
Equipment and systems |  | $ | 48,979 |  |  | $ | 8,768 |  |  | $ | 123,431 |  |  | $ | 23,357 |
Services and technology development |  |  | 3,327 |  |  |  | 329 |  |  |  | 8,147 |  |  |  | 1,228 |
Total |  | $ | 52,306 |  |  | $ | 9,097 |  |  | $ | 131,578 |  |  | $ | 24,585 |
Region: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Americas |  | $ | 47,737 |  |  | $ | - |  |  | $ | 121,696 |  |  | $ | 1 |
Asia Pacific |  |  | 2,293 |  |  |  | 9,080 |  |  |  | 4,280 |  |  |  | 24,562 |
EMEA |  |  | 2,276 |  |  |  | 17 |  |  |  | 5,602 |  |  |  | 22 |
Total |  | $ | 52,306 |  |  | $ | 9,097 |  |  | $ | 131,578 |  |  | $ | 24,585 |
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] |
|  | Unbilled Accounts Receivable |  |  | Deferred Program Costs |  |  | Contract Liabilities |
Beginning balance as of March 31, 2025 |  | $ | 6,376 |  |  | $ | 5,757 |  |  | $ | 76,133 |
Increase for balance acquired |  |  | — |  |  |  | — |  |  |  | 19,783 |
Increases for costs incurred to fulfill performance obligations |  |  | — |  |  |  | 23,174 |  |  |  | — |
Increase (decrease) due to customer billings |  |  | (15,991 | ) |  |  | — |  |  |  | 81,667 |
Decrease due to cost recognition on completed performance obligations |  |  | — |  |  |  | (21,767 | ) |  |  | — |
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations |  |  | 22,399 |  |  |  | — |  |  |  | (88,591 | )
Other changes and FX impact |  |  | 12 |  |  |  | (1 | ) |  |  | 371 |
Ending balance as of December 31, 2025 |  | $ | 12,796 |  |  | $ | 7,163 |  |  | $ | 89,363 |
|  | Unbilled Accounts Receivable |  |  | Deferred Program Costs |  |  | Contract Liabilities |
Beginning balance as of March 31, 2024 |  | $ | 6,150 |  |  | $ | 2,523 |  |  | $ | 57,829 |
Increase for balances acquired |  |  | — |  |  |  | — |  |  |  | 5,049 |
Increases for costs incurred to fulfill performance obligations |  |  | — |  |  |  | 10,876 |  |  |  | — |
Increase (decrease) due to customer billings |  |  | (7,139 | ) |  |  | — |  |  |  | 96,400 |
Decrease due to cost recognition on completed performance obligations |  |  | — |  |  |  | (6,133 | ) |  |  | — |
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations |  |  | 6,120 |  |  |  | — |  |  |  | (75,410 | )
Other changes and FX impact |  |  | (18 | ) |  |  | (11 | ) |  |  | (540 | )
Ending balance as of December 31, 2024 |  | $ | 5,113 |  |  | $ | 7,255 |  |  | $ | 83,328 |
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] |
|  |  | Three Months Ended |  |  | Nine Months Ended |
| Reportable |  | December 31, |  |  | December 31, |
| Segment |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Inox Wind Limited | Wind |  |  | 14 | % |  |  | 10 | % |  |  | 15 | % |  |  | 13 | %
Innomotics LLC | Grid |  |  | <10% |  |  |  | 14 | % |  |  | <10% |  |  |  | <10% |
Fuji Bridex Pte Ltd | Grid |  |  | <10% |  |  |  | <10% |  |  |  | 11 | % |  |  | <10% |

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