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Note 3 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenues	$ 27,680	$ 27,908	$ 50,360	$ 53,328
Grid [Member]
Revenues	25,698	24,619	45,527	48,119
Grid [Member] | Americas [Member]
Revenues	18,021	18,115	34,923	40,760
Grid [Member] | Asia Pacific [Member]
Revenues	6,178	3,269	8,855	3,867
Grid [Member] | EMEA [Member]
Revenues	1,499	3,235	1,749	3,492
Wind [Member]
Revenues	1,982	3,289	4,833	5,209
Wind [Member] | Americas [Member]
Revenues	0	59	0	78
Wind [Member] | Asia Pacific [Member]
Revenues	1,912	3,220	4,763	5,091
Wind [Member] | EMEA [Member]
Revenues	70	10	70	40
Equipment and Systems [Member] | Grid [Member]
Revenues	24,128	23,031	42,204	44,189
Equipment and Systems [Member] | Wind [Member]
Revenues	1,330	1,826	3,302	2,860
Services and Technology Development [Member] | Grid [Member]
Revenues	1,570	1,588	3,323	3,930
Services and Technology Development [Member] | Wind [Member]
Revenues	$ 652	$ 1,463	$ 1,531	$ 2,349

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.

+ References

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-Name Accounting Standards Codification
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