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Note 18 - Business Segments (Tables) | 9 Months Ended
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Dec. 31, 2025
Notes Tables |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | Three Months Ended December 31, 2025 |  |  | Nine Months Ended December 31, 2025 |
|  | Grid |  |  | Wind |  |  | Unallocated |  |  | Total |  |  | Grid |  |  | Wind |  |  | Unallocated |  |  | Total |
Segment operating income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 63,187 |  |  | $ | 11,342 |  |  | $ | - |  |  | $ | 74,529 |  |  | $ | 177,616 |  |  | $ | 35,133 |  |  | $ | - |  |  | $ | 212,749 |
Less (a) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment other operating expenses (b) |  |  | 61,156 |  |  |  | 10,014 |  |  |  | - |  |  |  | 71,170 |  |  |  | 170,152 |  |  |  | 30,630 |  |  |  | - |  |  |  | 200,782 |
Segment operating income |  | $ | 2,031 |  |  | $ | 1,328 |  |  | $ | - |  |  | $ | 3,359 |  |  | $ | 7,464 |  |  | $ | 4,503 |  |  | $ | - |  |  | $ | 11,967 |
|  | Three Months Ended December 31, 2024 |  |  | Nine Months Ended December 31, 2024 |
|  | Grid |  |  | Wind |  |  | Unallocated |  |  | Total |  |  | Grid |  |  | Wind |  |  | Unallocated |  |  | Total |
Segment operating income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 52,306 |  |  | $ | 9,097 |  |  | $ | - |  |  | $ | 61,403 |  |  | $ | 131,578 |  |  | $ | 24,585 |  |  | $ | - |  |  | $ | 156,163 |
Less (a) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment other operating expenses (b) |  |  | 52,072 |  |  |  | 8,016 |  |  |  | - |  |  |  | 60,088 |  |  |  | 130,006 |  |  |  | 22,198 |  |  |  | 6,689 |  |  |  | 158,893 |
Segment operating income (loss) |  | $ | 234 |  |  | $ | 1,081 |  |  | $ | - |  |  | $ | 1,315 |  |  | $ | 1,572 |  |  | $ | 2,387 |  |  | $ | (6,689 | ) |  | $ | (2,730 | )
|  | Three Months Ended December 31, |  |  | Nine Months Ended December 31, 2025 |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Operating income (loss): |  | $ | 3,359 |  |  | $ | 1,315 |  |  | $ | 11,967 |  |  | $ | (2,730 | )
Interest income, net |  |  | 1,997 |  |  |  | 802 |  |  |  | 5,198 |  |  | $ | 2,901 |
Other (expense)/income, net |  |  | 77 |  |  |  | 272 |  |  |  | 57 |  |  |  | (214 | )
Income (loss) before income tax benefit |  | $ | 5,433 |  |  | $ | 2,389 |  |  | $ | 17,222 |  |  | $ | (43 | )
|  | Three Months Ended December 31, |  |  | Nine Months Ended December 31, 2025 |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Grid |  | $ | 1,726 |  |  | $ | 1,567 |  |  | $ | 4,089 |  |  | $ | 3,920 |
Wind |  |  | 63 |  |  |  | 22 |  |  |  | 95 |  |  | $ | 64 |
Total |  | $ | 1,789 |  |  | $ | 1,589 |  |  | $ | 4,184 |  |  | $ | 3,984 |
Reconciliation of Assets from Segment to Consolidated [Table Text Block] |
|  | December 31, 2025 |  |  | March 31, 2025 |
Grid |  | $ | 558,431 |  |  | $ | 211,520 |
Wind |  |  | 13,969 |  |  |  | 13,697 |
Corporate assets |  |  | 147,134 |  |  |  | 85,304 |
Total |  | $ | 719,534 |  |  | $ | 310,521 |

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