Note 4 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Revenues	$ 299,155	$ 222,818	$ 145,639
Grid [Member]
Revenues	251,317	187,170	122,065
Grid [Member] \| North America [Member]
Revenues	174,103	169,104	104,423
Grid [Member] \| South America [Member]
Revenues	23,819	782	2,613
Grid [Member] \| Asia Pacific [Member]
Revenues	41,050	7,392	9,768
Grid [Member] \| EMEA [Member]
Revenues	12,345	9,892	5,261
Wind [Member]
Revenues	47,838	35,648	23,574
Wind [Member] \| North America [Member]
Revenues	16	2	102
Wind [Member] \| South America [Member]
Revenues	0	0	0
Wind [Member] \| Asia Pacific [Member]
Revenues	47,668	35,608	23,404
Wind [Member] \| EMEA [Member]
Revenues	$ 154	$ 38	$ 68

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 924
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-Topic 606
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-Topic 606
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+ Details