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Note 19 - Business Segments - Operating Results for Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Revenues	$ 108,435	$ 87,125	$ 108,435	$ 87,125
Operating Income (loss)	$ (21,089)	$ (23,165)	(21,089)	(23,165)
Corporate, Non-Segment [Member]
Operating Income (loss)			1,190	(6,545)
Grid [Member]
Revenues			98,876	70,528
Grid [Member] | Operating Segments [Member]
Operating Income (loss)			(20,725)	(13,318)
Wind [Member]
Revenues			9,559	16,597
Wind [Member] | Operating Segments [Member]
Operating Income (loss)			$ (1,554)	$ (3,302)

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