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Note 17 - Business Segments - Operating Results for Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenues	$ 27,680	$ 27,908	$ 50,360	$ 53,328
Operating Income (loss)	(8,092)	(4,302)	(16,961)	(11,801)
Corporate, Non-Segment [Member]
Operating Income (loss)	(729)	1,329	(1,931)	(63)
Grid [Member]
Revenues	25,698	24,619	45,527	48,119
Grid [Member] | Operating Segments [Member]
Operating Income (loss)	(6,495)	(5,836)	(13,776)	(11,180)
Wind [Member]
Revenues	1,982	3,289	4,833	5,209
Wind [Member] | Operating Segments [Member]
Operating Income (loss)	$ (868)	$ 205	$ (1,254)	$ (558)

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The net result for the period of deducting operating expenses from operating revenues.

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