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Note 17 - Business Segments (Tables) | 3 Months Ended
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Jun. 30, 2025
Notes Tables |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | Three Months Ended June 30, 2025 |
|  | Grid |  |  | Wind |  |  | Unallocated |  |  | Total |
Segment operating income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 60,087 |  |  | $ | 12,271 |  |  | $ | - |  |  | $ | 72,358 |
Less (a) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment other operating expenses (b) |  |  | 55,932 |  |  |  | 10,782 |  |  |  | - |  |  |  | 66,714 |
Segment operating income |  | $ | 4,155 |  |  | $ | 1,489 |  |  | $ | - |  |  | $ | 5,644 |
|  | Three Months Ended June 30, 2024 |
|  | Grid |  |  | Wind |  |  | Unallocated |  |  | Total |
Segment operating income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 32,336 |  |  | $ | 7,954 |  |  | $ | - |  |  | $ | 40,290 |
Less (a) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment other operating expenses (b) |  |  | 32,573 |  |  |  | 7,088 |  |  |  | 3,920 |  |  |  | 43,581 |
Segment operating income (loss) |  | $ | (237 | ) |  | $ | 866 |  |  | $ | (3,920 | ) |  | $ | (3,291 | )
|  | Three Months Ended June 30, |
|  | 2025 |  |  | 2024 |
Operating income (loss): |  | $ | 5,644 |  |  | $ | (3,291 | )
Interest income, net |  |  | 932 |  |  |  | 1,120 |
Other income (expense), net |  |  | 347 |  |  |  | (160 | )
Income (loss) before income tax expense |  | $ | 6,923 |  |  | $ | (2,331 | )
|  | Three Months Ended June 30, |
|  | 2025 |  |  | 2024 |
Grid |  | $ | 1,202 |  |  | $ | 987 |
Wind |  |  | 27 |  |  |  | 21 |
Total |  | $ | 1,229 |  |  | $ | 1,008 |
Reconciliation of Assets from Segment to Consolidated [Table Text Block] |
|  | June 30, 2025 |  |  | March 31, 2025 |
Grid |  | $ | 221,959 |  |  | $ | 211,520 |
Wind |  |  | 17,437 |  |  |  | 13,697 |
Corporate assets |  |  | 213,450 |  |  |  | 85,304 |
Total |  | $ | 452,846 |  |  | $ | 310,521 |

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