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Note 17 - Business Segments (Tables) | 9 Months Ended
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Dec. 31, 2021
Notes Tables |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | Three Months Ended December 31, |  |  | Nine Months Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grid |  | $ | 25,050 |  |  | $ | 17,086 |  |  | $ | 73,169 |  |  | $ | 51,149 |
Wind |  |  | 1,749 |  |  |  | 6,546 |  |  |  | 6,957 |  |  |  | 14,812 |
Total |  | $ | 26,799 |  |  | $ | 23,632 |  |  | $ | 80,126 |  |  | $ | 65,961 |
|  | Three Months Ended December 31, |  |  | Nine Months Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Operating Income (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grid |  | $ | (3,691 | ) |  | $ | (5,826 | ) |  | $ | (14,873 | ) |  | $ | (8,388 | )
Wind |  |  | (1,678 | ) |  |  | 147 |  |  |  | (2,236 | ) |  |  | (1,956 | )
Unallocated corporate gain (expenses) |  |  | 989 |  |  |  | (3,579 | ) |  |  | 927 |  |  |  | (5,337 | )
Total |  | $ | (4,380 | ) |  | $ | (9,258 | ) |  | $ | (16,182 | ) |  | $ | (15,681 | )
Reconciliation of Assets from Segment to Consolidated [Table Text Block] |
|  | December 31, 2021 |  |  | March 31, 2021 |
Grid |  | $ | 113,512 |  |  | $ | 81,253 |
Wind |  |  | 8,641 |  |  |  | 6,098 |
Corporate assets |  |  | 53,143 |  |  |  | 81,515 |
Total |  | $ | 175,296 |  |  | $ | 168,866 |

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