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Note 3 - Revenue Recognition (Tables) | 6 Months Ended
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Sep. 30, 2022
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended September 30, 2022 |  |  | Six Months Ended September 30, 2022 |
Product Line: |  | Grid |  |  | Wind |  |  | Grid |  |  | Wind |
Equipment and systems |  | $ | 24,128 |  |  | $ | 1,330 |  |  | $ | 42,204 |  |  | $ | 3,302 |
Services and technology development |  |  | 1,570 |  |  |  | 652 |  |  |  | 3,323 |  |  |  | 1,531 |
Total |  | $ | 25,698 |  |  | $ | 1,982 |  |  | $ | 45,527 |  |  | $ | 4,833 |
Region: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Americas |  | $ | 18,021 |  |  |  | - |  |  | $ | 34,923 |  |  | $ | - |
Asia Pacific |  |  | 6,178 |  |  |  | 1,912 |  |  |  | 8,855 |  |  |  | 4,763 |
EMEA |  |  | 1,499 |  |  |  | 70 |  |  |  | 1,749 |  |  |  | 70 |
Total |  | $ | 25,698 |  |  | $ | 1,982 |  |  | $ | 45,527 |  |  | $ | 4,833 |
|  | Three Months Ended September 30, 2021 |  |  | Six Months Ended September 30, 2021 |
Product Line: |  | Grid |  |  | Wind |  |  | Grid |  |  | Wind |
Equipment and systems |  | $ | 23,031 |  |  | $ | 1,826 |  |  | $ | 44,189 |  |  | $ | 2,860 |
Services and technology development |  |  | 1,588 |  |  |  | 1,463 |  |  |  | 3,930 |  |  |  | 2,349 |
Total |  | $ | 24,619 |  |  | $ | 3,289 |  |  | $ | 48,119 |  |  | $ | 5,209 |
Region: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Americas |  | $ | 18,115 |  |  | $ | 59 |  |  | $ | 40,760 |  |  | $ | 78 |
Asia Pacific |  |  | 3,269 |  |  |  | 3,220 |  |  |  | 3,867 |  |  |  | 5,091 |
EMEA |  |  | 3,235 |  |  |  | 10 |  |  |  | 3,492 |  |  |  | 40 |
Total |  | $ | 24,619 |  |  | $ | 3,289 |  |  | $ | 48,119 |  |  | $ | 5,209 |
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, 2022 |  | $ | 6,492 |  |  | $ | 858 |  |  | $ | 30,034 |
Increases for costs incurred to fulfill performance obligations |  |  |  |  |  |  | 782 |  |  |  |  |
Increase (decrease) due to customer billings |  |  | (7,322 | ) |  |  |  |  |  |  | 33,141 |
Decrease due to cost recognition on completed performance obligations |  |  |  |  |  |  | (697 | ) |  |  |  |
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations |  |  | 7,342 |  |  |  |  |  |  |  | (26,857 | )
Other changes and FX impact |  |  |  |  |  |  | (47 | ) |  |  | (863 | )
Ending balance as of September 30, 2022 |  | $ | 6,512 |  |  | $ | 896 |  |  | $ | 35,454 |
|  | Unbilled Accounts Receivable |  |  | Deferred Program Costs |  |  | Contract Liabilities |
Beginning balance as of March 31, 2021 |  | $ | 5,765 |  |  | $ | 977 |  |  | $ | 21,257 |
Increases for costs incurred to fulfill performance obligations |  |  | — |  |  |  | 2,277 |  |  |  | — |
Increase for balance acquired |  |  | — |  |  |  | 634 |  |  |  | 10,048 |
Increase (decrease) due to customer billings |  |  | (4,807 | ) |  |  | — |  |  |  | 34,344 |
Decrease due to cost recognition on completed performance obligations |  |  | — |  |  |  | (3,055 | ) |  |  | — |
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations |  |  | 7,838 |  |  |  | — |  |  |  | (34,169 | )
Other changes and FX impact |  |  | — |  |  |  | (3 | ) |  |  | 38 |
Ending balance as of September 30, 2021 |  | $ | 8,796 |  |  | $ | 830 |  |  | $ | 31,518 |
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] |
|  |  | Three Months Ended |  |  | Six Months Ended |
| Reportable |  | September 30, |  |  | September 30, |
| Segment |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Inox Wind Limited | Wind |  | <10% |  |  |  | 10 | % |  | <10% |  |  | <10% |
Fuji Bridex Pte Ltd | Grid |  |  | 17 | % |  | <10% |  |  |  | 13 | % |  | <10% |
Tri-State Generation and Transmission Association, Inc. | Grid |  | <10% |  |  |  | 12 | % |  | <10% |  |  | <10% |
Micron Technology | Grid |  | <10% |  |  | <10% |  |  | <10% |  |  |  | 10 | %
Ascend Performance Materials Ops LLC | Grid |  |  | 12 | % |  | <10% |  |  | <10% |  |  | <10% |

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