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Note 17 - Business Segments - Operating Results for Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Revenues	$ 22,679	$ 25,420
Operating Income (loss)	(8,869)	(7,499)
Corporate, Non-Segment [Member]
Operating Income (loss)	(1,202)	(1,391)
Grid [Member]
Revenues	19,829	23,501
Grid [Member] | Operating Segments [Member]
Operating Income (loss)	(7,281)	(5,345)
Wind [Member]
Revenues	2,850	1,919
Wind [Member] | Operating Segments [Member]
Operating Income (loss)	$ (386)	$ (763)

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