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Note 2 - Revenue Recognition (Tables) | 9 Months Ended
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Dec. 31, 2023
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended December 31, 2023 |  |  | Nine Months Ended December 31, 2023 |
Product Line: |  | Grid |  |  | Wind |  |  | Grid |  |  | Wind |
Equipment and systems |  | $ | 31,210 |  |  | $ | 4,983 |  |  | $ | 81,181 |  |  | $ | 13,844 |
Services and technology development |  |  | 2,393 |  |  |  | 767 |  |  |  | 6,673 |  |  |  | 1,913 |
Total |  | $ | 33,603 |  |  | $ | 5,750 |  |  | $ | 87,854 |  |  | $ | 15,757 |
Region: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Americas |  | $ | 26,782 |  |  | $ | 45 |  |  | $ | 74,640 |  |  | $ | 102 |
Asia Pacific |  |  | 3,704 |  |  |  | 5,660 |  |  |  | 8,832 |  |  |  | 15,587 |
EMEA |  |  | 3,117 |  |  |  | 45 |  |  |  | 4,382 |  |  |  | 68 |
Total |  | $ | 33,603 |  |  | $ | 5,750 |  |  | $ | 87,854 |  |  | $ | 15,757 |
|  | Three Months Ended December 31, 2022 |  |  | Nine Months Ended December 31, 2022 |
Product Line: |  | Grid |  |  | Wind |  |  | Grid |  |  | Wind |
Equipment and systems |  | $ | 19,475 |  |  | $ | 2,842 |  |  | $ | 61,680 |  |  | $ | 6,144 |
Services and technology development |  |  | 1,334 |  |  |  | 230 |  |  |  | 4,657 |  |  |  | 1,760 |
Total |  | $ | 20,809 |  |  | $ | 3,072 |  |  | $ | 66,337 |  |  | $ | 7,904 |
Region: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Americas |  | $ | 17,010 |  |  | $ | 19 |  |  | $ | 51,934 |  |  | $ | 19 |
Asia Pacific |  |  | 1,760 |  |  |  | 3,053 |  |  |  | 10,615 |  |  |  | 7,815 |
EMEA |  |  | 2,039 |  |  |  | — |  |  |  | 3,788 |  |  |  | 70 |
Total |  | $ | 20,809 |  |  | $ | 3,072 |  |  | $ | 66,337 |  |  | $ | 7,904 |
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, 2023 |  | $ | 9,958 |  |  | $ | 2,136 |  |  | $ | 50,760 |
Increases for costs incurred to fulfill performance obligations |  |  | — |  |  |  | 2,714 |  |  |  | — |
Increase (decrease) due to customer billings |  |  | (18,354 | ) |  |  | — |  |  |  | 55,018 |
Decrease due to cost recognition on completed performance obligations |  |  | — |  |  |  | (3,518 | ) |  |  | — |
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations |  |  | 12,969 |  |  |  | — |  |  |  | (46,190 | )
Other changes and FX impact |  |  | 15 |  |  |  | 5 |  |  |  | 155 |
Ending balance as of December 31, 2023 |  | $ | 4,588 |  |  | $ | 1,337 |  |  | $ | 59,743 |
|  | Unbilled Accounts Receivable |  |  | Deferred Program Costs |  |  | Contract Liabilities |
Beginning balance as of March 31, 2022 |  | $ | 6,492 |  |  | $ | 858 |  |  | $ | 30,034 |
Increases for costs incurred to fulfill performance obligations |  |  | — |  |  |  | 909 |  |  |  | — |
Increase (decrease) due to customer billings |  |  | (11,723 | ) |  |  | — |  |  |  | 48,013 |
Decrease due to cost recognition on completed performance obligations |  |  | — |  |  |  | (791 | ) |  |  | — |
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations |  |  | 9,544 |  |  |  | — |  |  |  | (36,452 | )
Other changes and FX impact |  |  | — |  |  |  | (15 | ) |  |  | (180 | )
Ending balance as of December 31, 2022 |  | $ | 4,313 |  |  | $ | 961 |  |  | $ | 41,415 |
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] |
|  |  | Three Months Ended |  |  | Nine Months Ended |
| Reportable |  | December 31, |  |  | December 31, |
| Segment |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Inox Wind Limited | Wind |  |  | 11 | % |  |  | 11 | % |  |  | 12 | % |  | <10% |
Fuji Bridex Pte Ltd | Grid |  | <10% |  |  | <10% |  |  | <10% |  |  |  | 10 | %

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