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Note 19 - Business Segments - Operating Results for Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenues	$ 54,471	$ 34,004	$ 94,761	$ 64,258
Operating Income (loss)	(753)	(2,369)	(4,043)	(7,702)
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Operating Income (loss)	(3,605)	(1,942)	(8,753)	(4,655)
Grid [Member]
Revenues	46,936	28,515	79,272	54,251
Grid [Member] | Operating Segments [Member]
Revenues	46,936	28,515	79,272	54,251
Operating Income (loss)	2,336	(679)	3,195	(2,649)
Wind [Member]
Revenues	7,535	5,489	15,489	10,007
Wind [Member] | Operating Segments [Member]
Revenues	7,535	5,489	15,489	10,007
Operating Income (loss)	$ 516	$ 252	$ 1,515	$ (398)

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