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Note 4 - Revenue Recognition (Tables) | 12 Months Ended
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Mar. 31, 2022
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Year Ended March 31, 2022 |
Product Line: |  | Grid |  |  | Wind |
Equipment and systems |  | $ | 91,704 |  |  | $ | 6,169 |
Services and technology development |  |  | 7,172 |  |  |  | 3,390 |
Total |  | $ | 98,876 |  |  | $ | 9,559 |
Region: |  |  |  |  |  |  |  |
Americas |  | $ | 73,955 |  |  | $ | 145 |
Asia Pacific |  |  | 19,397 |  |  |  | 9,346 |
EMEA |  |  | 5,524 |  |  |  | 68 |
Total |  | $ | 98,876 |  |  | $ | 9,559 |
|  | Year Ended March 31, 2021 |
Product Line: |  | Grid |  |  | Wind |
Equipment and systems |  | $ | 65,930 |  |  | $ | 14,362 |
Services and technology development |  |  | 4,598 |  |  |  | 2,235 |
Total |  | $ | 70,528 |  |  | $ | 16,597 |
Region: |  |  |  |  |  |  |  |
Americas |  | $ | 54,168 |  |  | $ | 87 |
Asia Pacific |  |  | 11,326 |  |  |  | 16,207 |
EMEA |  |  | 5,034 |  |  |  | 303 |
Total |  | $ | 70,528 |  |  | $ | 16,597 |
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] |
|  | Unbilled AR |  |  | Deferred Program Costs |  |  | Contract Liabilities |
Beginning balance as of March 31, 2021 |  | $ | 5,765 |  |  | $ | 977 |  |  | $ | 21,257 |
Increases for balances acquired |  |  | — |  |  |  | 634 |  |  |  | 10,048 |
Increases for costs incurred to fulfill performance obligations |  |  | — |  |  |  | 4,814 |  |  |  | — |
Increase (decrease) due to customer billings |  |  | (16,125 | ) |  |  | — |  |  |  | 68,895 |
Decrease due to cost recognition on completed performance obligations |  |  | — |  |  |  | (5,551 | ) |  |  | — |
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations |  |  | 16,852 |  |  |  | — |  |  |  | (70,141 | )
Other changes and FX impact |  |  | — |  |  |  | (16 | ) |  |  | (25 | )
Ending balance as of March 31, 2022 |  | $ | 6,492 |  |  | $ | 858 |  |  | $ | 30,034 |
|  | Unbilled AR |  |  | Deferred Program Costs |  |  | Contract Liabilities |
Beginning balance as of March 31, 2020 |  | $ | 5,711 |  |  | $ | 1,631 |  |  | $ | 26,142 |
Increases for balances acquired |  |  | 101 |  |  |  | — |  |  |  | 2,700 |
Increases for costs incurred to fulfill performance obligations |  |  | — |  |  |  | 7,674 |  |  |  | — |
Increase (decrease) due to customer billings |  |  | (8,687 | ) |  |  | — |  |  |  | 52,988 |
Decrease due to cost recognition on completed performance obligations |  |  | — |  |  |  | (8,346 | ) |  |  | — |
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations |  |  | 8,640 |  |  |  | — |  |  |  | (61,183 | )
Other changes and FX impact |  |  | — |  |  |  | 18 |  |  |  | 610 |
Ending balance as of March 31, 2021 |  | $ | 5,765 |  |  | $ | 977 |  |  | $ | 21,257 |
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] |
|  |  | Year Ended |
| Reportable |  | March 31, |
| Segment |  | 2022 |  |  | 2021 |
EPC Services Company | Grid |  |  | <10% |  |  | 13% |
Fuji Bridex Pte Ltd | Grid |  |  | 14% |  |  | <10% |

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