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Note 3 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024
Revenues	$ 74,529	$ 61,403	$ 212,749	$ 156,163
Grid [Member]
Revenues	63,187	52,306	177,616	131,578
Grid [Member] | Americas [Member]
Revenues	51,974	47,737	137,394	121,696
Grid [Member] | Asia Pacific [Member]
Revenues	7,253	2,293	29,583	4,280
Grid [Member] | EMEA [Member]
Revenues	3,960	2,276	10,639	5,602
Wind [Member]
Revenues	11,342	9,097	35,133	24,585
Wind [Member] | Americas [Member]
Revenues	0	0	16	1
Wind [Member] | Asia Pacific [Member]
Revenues	11,326	9,080	35,022	24,562
Wind [Member] | EMEA [Member]
Revenues	16	17	95	22
Equipment and Systems [Member] | Grid [Member]
Revenues	56,004	48,979	156,300	123,431
Equipment and Systems [Member] | Wind [Member]
Revenues	143	8,768	445	23,357
Services and Technology Development [Member] | Grid [Member]
Revenues	7,183	3,327	21,316	8,147
Services and Technology Development [Member] | Wind [Member]
Revenues	$ 11,199	$ 329	$ 34,688	$ 1,228

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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