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Note 3 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenues	$ 145,639	$ 105,984
Grid [Member]
Revenues	122,065	94,631
Grid [Member] | Americas [Member]
Revenues	107,036	67,664
Grid [Member] | Asia Pacific [Member]
Revenues	9,768	20,326
Grid [Member] | EMEA [Member]
Revenues	5,261	6,641
Wind [Member]
Revenues	23,574	11,353
Wind [Member] | Americas [Member]
Revenues	102	19
Wind [Member] | Asia Pacific [Member]
Revenues	23,404	11,199
Wind [Member] | EMEA [Member]
Revenues	68	135
Equipment and Systems [Member] | Grid [Member]
Revenues	112,829	88,311
Equipment and Systems [Member] | Wind [Member]
Revenues	21,211	9,282
Services and Technology Development [Member] | Grid [Member]
Revenues	9,236	6,320
Services and Technology Development [Member] | Wind [Member]
Revenues	$ 2,363	$ 2,071

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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