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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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues	$ 27,908	$ 21,117	$ 53,328	$ 42,329
Operating Income (loss)	(4,302)	(3,206)	(11,801)	(6,423)
Corporate, Non-Segment [Member]
Operating Income (loss)	1,329	(849)	(63)	(1,758)
Grid [Member]
Revenues	24,619	16,347	48,119	34,062
Grid [Member] | Operating Segments [Member]
Operating Income (loss)	(5,836)	(1,374)	(11,180)	(2,562)
Wind [Member]
Revenues	3,289	4,770	5,209	8,267
Wind [Member] | Operating Segments [Member]
Operating Income (loss)	$ 205	$ (983)	$ (558)	$ (2,103)

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

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