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Note 3 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Revenues	$ 26,799	$ 23,632	$ 80,126	$ 65,961
Grid [Member]
Revenues	25,050	17,086	73,169	51,149
Grid [Member] | Americas [Member]
Revenues	16,739	13,394	57,498	39,626
Grid [Member] | Asia Pacific [Member]
Revenues	7,064	351	10,931	6,736
Grid [Member] | EMEA [Member]
Revenues	1,247	3,341	4,740	4,787
Wind [Member]
Revenues	1,749	6,546	6,957	14,812
Wind [Member] | Americas [Member]
Revenues	56	14	134	56
Wind [Member] | Asia Pacific [Member]
Revenues	1,690	6,461	6,781	14,463
Wind [Member] | EMEA [Member]
Revenues	3	71	42	293
Equipment and Systems [Member] | Grid [Member]
Revenues	23,416	15,930	67,605	47,729
Equipment and Systems [Member] | Wind [Member]
Revenues	1,309	6,153	4,168	12,828
Services and Technology Development [Member] | Grid [Member]
Revenues	1,634	1,156	5,564	3,420
Services and Technology Development [Member] | Wind [Member]
Revenues	$ 440	$ 393	$ 2,789	$ 1,984

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.

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