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Note 17 - Business Segments - Operating Results for Business Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Revenues | $ 65,862 |  | $ 54,471 |  | $ 138,220 |  | $ 94,761 |
Segment other operating expenses | 62,897 | [1],[2] | 55,224 | [3],[4] | 129,610 | [1],[2] | 98,804 | [3],[4]
Segment operating income | 2,965 | [2] | (753) | [4] | 8,610 | [2] | (4,043) | [4]
Operating income (loss): | 2,965 | [2] | (753) | [4] | 8,610 | [2] | (4,043) | [4]
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) |
Depreciation and amortization | 1,297 |  | 1,387 |  | 2,525 |  | 2,395 |
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] |  |  |  |  |  |  |  |
Revenues | 0 |  | 0 |  | 0 |  | 0 |
Segment other operating expenses | 0 | [1],[2] | 2,762 | [3],[4] | 0 | [1],[2] | 6,682 | [3],[4]
Segment operating income | 0 | [2] | (2,762) | [4] | 0 | [2] | (6,682) | [4]
Operating income (loss): | 0 | [2] | (2,762) | [4] | 0 | [2] | (6,682) | [4]
Grid [Member] |  |  |  |  |  |  |  |
Revenues | 54,342 |  | 46,936 |  | 114,429 |  | 79,272 |
Grid [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |
Revenues | 54,342 |  | 46,936 |  | 114,429 |  | 79,272 |
Segment other operating expenses | 53,064 | [1],[2] | 45,366 | [3],[4] | 108,994 | [1],[2] | 77,939 | [3],[4]
Segment operating income | 1,278 | [2] | 1,570 | [4] | 5,435 | [2] | 1,333 | [4]
Operating income (loss): | 1,278 | [2] | 1,570 | [4] | 5,435 | [2] | 1,333 | [4]
Depreciation and amortization | 1,266 |  | 1,376 |  | 2,468 |  | 2,363 |
Wind [Member] |  |  |  |  |  |  |  |
Revenues | 11,520 |  | 7,535 |  | 23,791 |  | 15,489 |
Wind [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |
Revenues | 11,520 |  | 7,535 |  | 23,791 |  | 15,489 |
Segment other operating expenses | 9,833 | [1],[2] | 7,096 | [3],[4] | 20,616 | [1],[2] | 14,183 | [3],[4]
Segment operating income | 1,687 | [2] | 439 | [4] | 3,175 | [2] | 1,306 | [4]
Operating income (loss): | 1,687 | [2] | 439 | [4] | 3,175 | [2] | 1,306 | [4]
Depreciation and amortization | $ 31 |  | $ 11 |  | $ 57 |  | $ 32 |
[1] | Segment other operating expense includes cost of sales, research and development expense, selling general, and administrative expense, and amortization of acquisition related intangibles.
[2] | The significant expense categories and amounts align with the segment-level information that is regularly provided to the chief operating decision maker.
[3] | Segment other operating expense includes cost of sales, research and development expense, selling general, and administrative expense, amortization of acquisition related intangibles, and gain/loss on contingent consideration.
[4] | The significant expense categories and amounts align with the segment-level information that is regularly provided to the chief operating decision maker.

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