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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, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Revenues | $ 27,680 | $ 27,908 | $ 50,360 | $ 53,328
Operating Income (loss) | (8,092) | (4,302) | (16,961) | (11,801)
Corporate, Non-Segment [Member] |  |  |  |
Operating Income (loss) | (729) | 1,329 | (1,931) | (63)
Grid [Member] |  |  |  |
Revenues | 25,698 | 24,619 | 45,527 | 48,119
Grid [Member] | Operating Segments [Member] |  |  |  |
Operating Income (loss) | (6,495) | (5,836) | (13,776) | (11,180)
Wind [Member] |  |  |  |
Revenues | 1,982 | 3,289 | 4,833 | 5,209
Wind [Member] | Operating Segments [Member] |  |  |  |
Operating Income (loss) | $ (868) | $ 205 | $ (1,254) | $ (558)

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