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Note 3 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Revenues	$ 72,358	$ 40,290
Grid [Member]
Revenues	60,087	32,336
Grid [Member] | Americas [Member]
Revenues	38,020	30,479
Grid [Member] | Asia Pacific [Member]
Revenues	18,304	1,199
Grid [Member] | EMEA [Member]
Revenues	3,763	658
Wind [Member]
Revenues	12,271	7,954
Wind [Member] | Americas [Member]
Revenues	0	0
Wind [Member] | Asia Pacific [Member]
Revenues	12,271	7,952
Wind [Member] | EMEA [Member]
Revenues	0	2
Equipment and Systems [Member] | Grid [Member]
Revenues	55,521	29,726
Equipment and Systems [Member] | Wind [Member]
Revenues	11,881	7,424
Services and Technology Development [Member] | Grid [Member]
Revenues	4,566	2,610
Services and Technology Development [Member] | Wind [Member]
Revenues	$ 390	$ 530

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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