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Note 4 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Revenues	$ 108,435	$ 87,125	$ 108,435	$ 87,125
Grid [Member]
Revenues			98,876	70,528
Grid [Member] | Americas [Member]
Revenues			73,955	54,168
Grid [Member] | Asia Pacific [Member]
Revenues			19,397	11,326
Grid [Member] | EMEA [Member]
Revenues			5,524	5,034
Wind [Member]
Revenues			9,559	16,597
Wind [Member] | Americas [Member]
Revenues			145	87
Wind [Member] | Asia Pacific [Member]
Revenues			9,346	16,207
Wind [Member] | EMEA [Member]
Revenues			68	303
Equipment and Systems [Member] | Grid [Member]
Revenues			91,704	65,930
Equipment and Systems [Member] | Wind [Member]
Revenues			6,169	14,362
Services and Technology Development [Member] | Grid [Member]
Revenues			7,172	4,598
Services and Technology Development [Member] | Wind [Member]
Revenues			$ 3,390	$ 2,235

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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