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Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Revenues	$ 40,290	$ 30,254
Grid [Member]
Revenues	32,336	25,737
Grid [Member] | Americas [Member]
Revenues	30,479	23,161
Grid [Member] | Asia Pacific [Member]
Revenues	1,199	1,711
Grid [Member] | EMEA [Member]
Revenues	658	865
Wind [Member]
Revenues	7,954	4,517
Wind [Member] | Americas [Member]
Revenues	0	0
Wind [Member] | Asia Pacific [Member]
Revenues	7,952	4,465
Wind [Member] | EMEA [Member]
Revenues	2	52
Equipment and Systems [Member] | Grid [Member]
Revenues	29,726	23,126
Equipment and Systems [Member] | Wind [Member]
Revenues	7,424	3,982
Services and Technology Development [Member] | Grid [Member]
Revenues	2,610	2,611
Services and Technology Development [Member] | Wind [Member]
Revenues	$ 530	$ 535

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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