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Note 4 - Revenue Recognition - Disaggregation of Revenue (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
Grid [Member]
Revenues			70,528	49,585
Grid [Member] | Americas [Member]
Revenues			54,168	33,207
Grid [Member] | Asia Pacific [Member]
Revenues			11,326	10,407
Grid [Member] | EMEA [Member]
Revenues			5,034	5,971
Wind [Member]
Revenues			16,597	14,253
Wind [Member] | Americas [Member]
Revenues			87	87
Wind [Member] | Asia Pacific [Member]
Revenues			16,207	13,996
Wind [Member] | EMEA [Member]
Revenues			303	170
Equipment and Systems [Member] | Grid [Member]
Revenues			65,930	44,065
Equipment and Systems [Member] | Wind [Member]
Revenues			14,362	12,282
Services and Technology Development [Member] | Grid [Member]
Revenues			4,598	5,520
Services and Technology Development [Member] | Wind [Member]
Revenues			$ 2,235	$ 1,971

X

- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

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