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Note 4 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Revenues	$ 222,818	$ 145,639
Grid [Member]
Revenues	187,170	122,065
Grid [Member] | Americas [Member]
Revenues	169,886	107,036
Grid [Member] | Asia Pacific [Member]
Revenues	7,392	9,768
Grid [Member] | EMEA [Member]
Revenues	9,892	5,261
Wind [Member]
Revenues	35,648	23,574
Wind [Member] | Americas [Member]
Revenues	2	102
Wind [Member] | Asia Pacific [Member]
Revenues	35,608	23,404
Wind [Member] | EMEA [Member]
Revenues	38	68
Equipment and Systems [Member] | Grid [Member]
Revenues	175,117	112,829
Equipment and Systems [Member] | Wind [Member]
Revenues	34,079	21,211
Services and Technology Development [Member] | Grid [Member]
Revenues	12,053	9,236
Services and Technology Development [Member] | Wind [Member]
Revenues	$ 1,569	$ 2,363

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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