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Note 18 - Business Segments - Operating Results for Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Revenues	$ 87,125	$ 63,838	$ 87,125	$ 63,838
Operating profit (loss)	$ (23,165)	$ (23,129)	(23,165)	(23,129)
Corporate, Non-Segment [Member]
Operating profit (loss)			(6,545)	(1,922)
Grid [Member]
Revenues			70,528	49,585
Grid [Member] | Operating Segments [Member]
Operating profit (loss)			(13,318)	(13,508)
Wind [Member]
Revenues			16,597	14,253
Wind [Member] | Operating Segments [Member]
Operating profit (loss)			$ (3,302)	$ (7,699)

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