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Note 3 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenues	$ 54,471	$ 34,004	$ 94,761	$ 64,258
Grid [Member]
Revenues	46,936	28,515	79,272	54,251
Grid [Member] | Americas [Member]
Revenues	43,479	24,696	73,957	47,856
Grid [Member] | Asia Pacific [Member]
Revenues	790	3,418	1,989	5,129
Grid [Member] | EMEA [Member]
Revenues	2,667	401	3,326	1,266
Wind [Member]
Revenues	7,535	5,489	15,489	10,007
Wind [Member] | Americas [Member]
Revenues	1	27	1	57
Wind [Member] | Asia Pacific [Member]
Revenues	7,531	5,462	15,483	9,928
Wind [Member] | EMEA [Member]
Revenues	3	0	5	22
Equipment and Systems [Member] | Grid [Member]
Revenues	43,747	22,682	74,452	45,808
Equipment and Systems [Member] | Wind [Member]
Revenues	7,166	4,879	14,591	8,862
Services and Technology Development [Member] | Grid [Member]
Revenues	3,189	5,833	4,820	8,443
Services and Technology Development [Member] | Wind [Member]
Revenues	$ 369	$ 610	$ 898	$ 1,145

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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