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Note 3 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenues	$ 65,862	$ 54,471	$ 138,220	$ 94,761
Grid [Member]
Revenues	54,342	46,936	114,429	79,272
Grid [Member] | Americas [Member]
Revenues	47,400	43,479	85,421	73,957
Grid [Member] | Asia Pacific [Member]
Revenues	4,026	790	22,329	1,989
Grid [Member] | EMEA [Member]
Revenues	2,916	2,667	6,679	3,326
Wind [Member]
Revenues	11,520	7,535	23,791	15,489
Wind [Member] | Americas [Member]
Revenues	16	1	16	1
Wind [Member] | Asia Pacific [Member]
Revenues	11,425	7,531	23,696	15,483
Wind [Member] | EMEA [Member]
Revenues	79	3	79	5
Equipment and Systems [Member] | Grid [Member]
Revenues	49,951	43,747	105,574	74,452
Equipment and Systems [Member] | Wind [Member]
Revenues	11,223	7,166	23,103	14,591
Services and Technology Development [Member] | Grid [Member]
Revenues	4,391	3,189	8,855	4,820
Services and Technology Development [Member] | Wind [Member]
Revenues	$ 297	$ 369	$ 688	$ 898

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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