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Note 18 - Business Segments - Operating Results for Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenues	$ 34,004	$ 27,680	$ 64,258	$ 50,360
Operating Income (loss)	(2,369)	(8,092)	(7,702)	(16,961)
Corporate, Non-Segment [Member]
Operating Income (loss)	(1,942)	(729)	(4,655)	(1,931)
Grid [Member]
Revenues	28,515	25,698	54,251	45,527
Grid [Member] | Operating Segments [Member]
Revenues	28,515	25,698	54,251	45,527
Operating Income (loss)	(679)	(6,495)	(2,649)	(13,776)
Wind [Member]
Revenues	5,489	1,982	10,007	4,833
Wind [Member] | Operating Segments [Member]
Revenues	5,489	1,982	10,007	4,833
Operating Income (loss)	$ 252	$ (868)	$ (398)	$ (1,254)

X

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

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