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Note 17 - Business Segments (Tables) | 6 Months Ended
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Sep. 30, 2022
Notes Tables |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Six Months Ended September 30, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grid |  | $ | 25,698 |  |  | $ | 24,619 |  |  | $ | 45,527 |  |  | $ | 48,119 |
Wind |  |  | 1,982 |  |  |  | 3,289 |  |  |  | 4,833 |  |  |  | 5,209 |
Total |  | $ | 27,680 |  |  | $ | 27,908 |  |  | $ | 50,360 |  |  | $ | 53,328 |
|  | Three Months Ended September 30, |  |  | Six Months Ended September 30, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Operating loss: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grid |  | $ | (6,495 | ) |  | $ | (5,836 | ) |  | $ | (13,776 | ) |  | $ | (11,180 | )
Wind |  |  | (868 | ) |  |  | 205 |  |  |  | (1,254 | ) |  |  | (558 | )
Unallocated corporate expenses |  |  | (729 | ) |  |  | 1,329 |  |  |  | (1,931 | ) |  |  | (63 | )
Total |  | $ | (8,092 | ) |  | $ | (4,302 | ) |  | $ | (16,961 | ) |  | $ | (11,801 | )
Reconciliation of Assets from Segment to Consolidated [Table Text Block] |
|  | September 30, 2022 |  |  | March 31, 2022 |
Grid |  | $ | 121,227 |  |  | $ | 114,053 |
Wind |  |  | 9,716 |  |  |  | 9,866 |
Corporate assets |  |  | 40,804 |  |  |  | 49,968 |
Total |  | $ | 171,747 |  |  | $ | 173,887 |

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