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Note 19 - Business Segments - Operating Results for Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Revenues	$ 61,403	$ 39,353	$ 156,163	$ 103,611
Operating Income (loss)	1,315	(1,438)	(2,730)	(9,141)
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Operating Income (loss)	(2,866)	(1,992)	(11,621)	(6,646)
Grid [Member]
Revenues	52,306	33,603	131,578	87,854
Grid [Member] | Operating Segments [Member]
Revenues	52,306	33,603	131,578	87,854
Operating Income (loss)	2,819	268	6,014	(2,383)
Wind [Member]
Revenues	9,097	5,750	24,585	15,757
Wind [Member] | Operating Segments [Member]
Revenues	9,097	5,750	24,585	15,757
Operating Income (loss)	$ 1,362	$ 286	$ 2,877	$ (112)

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