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Note 18 - Business Segments (Tables)

12 Months Ended

Mar. 31, 2021

Notes Tables

Schedule of Segment Reporting Information, by Segment [Table Text Block]

		Fiscal Years Ended March 31,
		2021				2020
Revenues:
Grid		$	70,528			$	49,585
Wind			16,597				14,253
Total		$	87,125			$	63,838

		Fiscal Years Ended March 31,
		2021				2020
Operating loss:
Grid		$	(13,318	)		$	(13,508	)
Wind			(3,302	)			(7,699	)
Unallocated corporate expenses			(6,545	)			(1,922	)
Total		$	(23,165	)		$	(23,129	)

Reconciliation of Assets from Segment to Consolidated [Table Text Block]

		March 31, 2021				March 31, 2020
Grid		$	81,253			$	44,044
Wind			6,098				14,250
Corporate assets			81,515				65,815
Total		$	168,866			$	124,109

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]

		March 31,
		2021				2020
North America		$	8,777			$	8,113
Europe			174				397
Asia Pacific			46				55
Total		$	8,997			$	8,565

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Tabular disclosure of all significant reconciling items in the reconciliation of total assets from reportable segments to the entity's consolidated assets.

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