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Note 17 - Business Segments (Tables) | 6 Months Ended
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Sep. 30, 2025
Notes Tables |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | Three Months Ended September 30, 2025 |  |  | Six Months Ended September 30, 2025 |
|  | Grid |  |  | Wind |  |  | Unallocated |  |  | Total |  |  | Grid |  |  | Wind |  |  | Unallocated |  |  | Total |
Segment operating income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 54,342 |  |  | $ | 11,520 |  |  | $ | - |  |  | $ | 65,862 |  |  | $ | 114,429 |  |  | $ | 23,791 |  |  | $ | - |  |  | $ | 138,220 |
Less (a) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment other operating expenses (b) |  |  | 53,064 |  |  |  | 9,833 |  |  |  | - |  |  |  | 62,897 |  |  |  | 108,994 |  |  |  | 20,616 |  |  |  | - |  |  |  | 129,610 |
Segment operating income |  | $ | 1,278 |  |  | $ | 1,687 |  |  | $ | - |  |  | $ | 2,965 |  |  | $ | 5,435 |  |  | $ | 3,175 |  |  | $ | - |  |  | $ | 8,610 |
|  | Three Months Ended September 30, 2024 |  |  | Six Months Ended September 30, 2024 |
|  | Grid |  |  | Wind |  |  | Unallocated |  |  | Total |  |  | Grid |  |  | Wind |  |  | Unallocated |  |  | Total |
Segment operating income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 46,936 |  |  | $ | 7,535 |  |  | $ | - |  |  | $ | 54,471 |  |  | $ | 79,272 |  |  | $ | 15,489 |  |  | $ | - |  |  | $ | 94,761 |
Less (a) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment other operating expenses (b) |  |  | 45,366 |  |  |  | 7,096 |  |  |  | 2,762 |  |  |  | 55,224 |  |  |  | 77,939 |  |  |  | 14,183 |  |  |  | 6,682 |  |  |  | 98,804 |
Segment operating income (loss) |  | $ | 1,570 |  |  | $ | 439 |  |  | $ | (2,762 | ) |  | $ | (753 | ) |  | $ | 1,333 |  |  | $ | 1,306 |  |  | $ | (6,682 | ) |  | $ | (4,043 | )
|  | Three Months Ended September 30, |  |  | Six Months Ended September 30, 2025 |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Operating income (loss): |  | $ | 2,965 |  |  | $ | (753 | ) |  | $ | 8,610 |  |  | $ | (4,043 | )
Interest income, net |  |  | 2,269 |  |  |  | 979 |  |  |  | 3,201 |  |  | $ | 2,099 |
Other expense, net |  |  | (367 | ) |  |  | (329 | ) |  |  | (21 | ) |  |  | (489 | )
Income (loss) before income tax expense (benefit) |  | $ | 4,867 |  |  | $ | (103 | ) |  | $ | 11,790 |  |  | $ | (2,433 | )
|  | Three Months Ended September 30, |  |  | Six Months Ended September 30, 2025 |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Grid |  | $ | 1,266 |  |  | $ | 1,376 |  |  | $ | 2,468 |  |  | $ | 2,363 |
Wind |  |  | 31 |  |  |  | 11 |  |  |  | 57 |  |  | $ | 32 |
Total |  | $ | 1,297 |  |  | $ | 1,387 |  |  | $ | 2,525 |  |  | $ | 2,395 |
Reconciliation of Assets from Segment to Consolidated [Table Text Block] |
|  | September 30, 2025 |  |  | March 31, 2025 |
Grid |  | $ | 209,101 |  |  | $ | 211,520 |
Wind |  |  | 17,665 |  |  |  | 13,697 |
Corporate assets |  |  | 218,837 |  |  |  | 85,304 |
Total |  | $ | 445,603 |  |  | $ | 310,521 |

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