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Note 15 - Business Segments - Operating Results for Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Revenues	$ 21,213	$ 13,770
Operating profit (loss)	(3,217)	(6,236)
Corporate, Non-Segment [Member]
Operating profit (loss)	(909)	(249)
Grid [Member]
Revenues	17,715	9,855
Grid [Member] | Operating Segments [Member]
Operating profit (loss)	(1,188)	(4,663)
Wind [Member]
Revenues	3,498	3,915
Wind [Member] | Operating Segments [Member]
Operating profit (loss)	$ (1,120)	$ (1,324)

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