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Note 17 - Business Segments - Operating Results for Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Revenues	$ 40,290	$ 30,254
Operating Income (loss)	(3,291)	(5,333)
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Operating Income (loss)	(5,149)	(2,713)
Grid [Member]
Revenues	32,336	25,737
Grid [Member] | Operating Segments [Member]
Revenues	32,336	25,737
Operating Income (loss)	859	(1,971)
Wind [Member]
Revenues	7,954	4,517
Wind [Member] | Operating Segments [Member]
Revenues	7,954	4,517
Operating Income (loss)	$ 999	$ (649)

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