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Note 18 - Business Segments (Tables) | 9 Months Ended
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Dec. 31, 2023
Notes Tables |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | Three Months Ended December 31, |  |  | Nine Months Ended December 31, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grid |  | $ | 33,603 |  |  | $ | 20,809 |  |  | $ | 87,854 |  |  | $ | 66,337 |
Wind |  |  | 5,750 |  |  |  | 3,072 |  |  |  | 15,757 |  |  |  | 7,904 |
Total |  | $ | 39,353 |  |  | $ | 23,881 |  |  | $ | 103,611 |  |  | $ | 74,241 |
|  | Three Months Ended December 31, |  |  | Nine Months Ended December 31, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Operating income (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grid |  | $ | 268 |  |  | $ | (7,064 | ) |  | $ | (2,383 | ) |  | $ | (20,840 | )
Wind |  |  | 286 |  |  |  | (924 | ) |  |  | (112 | ) |  |  | (2,178 | )
Unallocated corporate expenses |  |  | (1,992 | ) |  |  | (1,221 | ) |  |  | (6,646 | ) |  |  | (3,152 | )
Total |  | $ | (1,438 | ) |  | $ | (9,209 | ) |  | $ | (9,141 | ) |  | $ | (26,170 | )
Reconciliation of Assets from Segment to Consolidated [Table Text Block] |
|  | December 31, 2023 |  |  | March 31, 2023 |
Grid |  | $ | 128,395 |  |  | $ | 135,296 |
Wind |  |  | 12,933 |  |  |  | 14,361 |
Corporate assets |  |  | 25,015 |  |  |  | 25,904 |
Total |  | $ | 166,343 |  |  | $ | 175,561 |

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