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Note 3 - Revenue Recognition (Tables) | 9 Months Ended
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Dec. 31, 2020
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended December 31, 2020 |  |  | Nine Months Ended December 31, 2020 |
Product Line: |  | Grid |  |  | Wind |  |  | Grid |  |  | Wind |
Equipment and systems |  | $ | 15,930 |  |  | $ | 6,153 |  |  | $ | 47,729 |  |  | $ | 12,828 |
Services and technology development |  |  | 1,156 |  |  |  | 393 |  |  |  | 3,420 |  |  |  | 1,984 |
Total |  | $ | 17,086 |  |  | $ | 6,546 |  |  | $ | 51,149 |  |  | $ | 14,812 |
Region: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Americas |  | $ | 13,394 |  |  | $ | 14 |  |  | $ | 39,626 |  |  | $ | 56 |
Asia Pacific |  |  | 351 |  |  |  | 6,461 |  |  |  | 6,736 |  |  |  | 14,463 |
EMEA |  |  | 3,341 |  |  |  | 71 |  |  |  | 4,787 |  |  |  | 293 |
Total |  | $ | 17,086 |  |  | $ | 6,546 |  |  | $ | 51,149 |  |  | $ | 14,812 |
|  | Three Months Ended December 31, 2019 |  |  | Nine Months Ended December 31, 2019 |
Product Line: |  | Grid |  |  | Wind |  |  | Grid |  |  | Wind |
Equipment and systems |  | $ | 14,040 |  |  | $ | 2,160 |  |  | $ | 32,438 |  |  | $ | 7,742 |
Services and technology development |  |  | 1,192 |  |  |  | 523 |  |  |  | 4,139 |  |  |  | 1,379 |
Total |  | $ | 15,232 |  |  | $ | 2,683 |  |  | $ | 36,577 |  |  | $ | 9,120 |
Region: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Americas |  | $ | 10,164 |  |  | $ | 2 |  |  | $ | 28,663 |  |  | $ | 49 |
Asia Pacific |  |  | 330 |  |  |  | 2,647 |  |  |  | 2,550 |  |  |  | 8,968 |
EMEA |  |  | 4,738 |  |  |  | 34 |  |  |  | 5,364 |  |  |  | 104 |
Total |  | $ | 15,232 |  |  | $ | 2,683 |  |  | $ | 36,577 |  |  | $ | 9,120 |
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, 2020 |  | $ | 5,711 |  |  | $ | 1,631 |  |  | $ | 26,142 |
Increases for costs incurred to fulfill performance obligations |  |  | — |  |  |  | 6,635 |  |  |  | — |
Increase for balances acquired |  |  | 101 |  |  |  | — |  |  |  | 2,700 |
Increase (decrease) due to customer billings |  |  | (8,255 | ) |  |  | — |  |  |  | 42,785 |
Decrease due to cost recognition on completed performance obligations |  |  | — |  |  |  | (6,969 | ) |  |  | — |
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations |  |  | 6,644 |  |  |  | — |  |  |  | (48,274 | )
Other changes and FX impact |  |  | — |  |  |  | 33 |  |  |  | 1,025 |
Ending balance as of December 31, 2020 |  | $ | 4,201 |  |  | $ | 1,330 |  |  | $ | 24,378 |
|  | Unbilled Accounts Receivable |  |  | Deferred Program Costs |  |  | Contract Liabilities |
Beginning balance as of March 31, 2019 |  | $ | 2,213 |  |  | $ | 318 |  |  | $ | 15,519 |
Increases for costs incurred to fulfill performance obligations |  |  | — |  |  |  | 3,001 |  |  |  | — |
Increase (decrease) due to customer billings |  |  | (7,417 | ) |  |  | — |  |  |  | 36,461 |
Decrease due to cost recognition on completed performance obligations |  |  | — |  |  |  | (2,221 | ) |  |  | — |
Increase (decrease) due to recognition of revenue based on transfer of control of performance obligations |  |  | 9,820 |  |  |  | — |  |  |  | (28,768 | )
Other changes and FX impact |  |  | (3 | ) |  |  | (1 | ) |  |  | (69 | )
Ending balance as of December 31, 2019 |  | $ | 4,613 |  |  | $ | 1,097 |  |  | $ | 23,143 |
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] |
|  |  | Three Months Ended |  |  | Nine Months Ended |
| Reportable |  | December 31, |  |  | December 31, |
| Segment |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Inox Wind Limited | Wind |  |  | 24 | % |  |  | <10% |  |  |  | 12 | % |  |  | 11 | %
Department of Homeland Security | Grid |  |  | <10% |  |  |  | 22 | % |  |  | <10% |  |  |  | 12 | %
Vestas | Grid |  |  | <10% |  |  |  | 25 | % |  |  | <10% |  |  |  | 10 | %
EPC Services | Grid |  |  | 14 | % |  |  | <10% |  |  |  | 17 | % |  |  | <10% |

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- Definition Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer. + References No definition available. + Details
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