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Note 3 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Revenues	$ 23,881	$ 26,799	$ 74,241	$ 80,126
Grid [Member]
Revenues	20,809	25,050	66,337	73,169
Grid [Member] | Americas [Member]
Revenues	17,010	16,739	51,934	57,498
Grid [Member] | Asia Pacific [Member]
Revenues	1,760	7,064	10,615	10,931
Grid [Member] | EMEA [Member]
Revenues	2,039	1,247	3,788	4,740
Wind [Member]
Revenues	3,072	1,749	7,904	6,957
Wind [Member] | Americas [Member]
Revenues	19	56	19	134
Wind [Member] | Asia Pacific [Member]
Revenues	3,053	1,690	7,815	6,781
Wind [Member] | EMEA [Member]
Revenues	0	3	70	42
Equipment and Systems [Member] | Grid [Member]
Revenues	19,475	23,416	61,680	67,605
Equipment and Systems [Member] | Wind [Member]
Revenues	2,842	1,309	6,144	4,168
Services and Technology Development [Member] | Grid [Member]
Revenues	1,334	1,634	4,657	5,564
Services and Technology Development [Member] | Wind [Member]
Revenues	$ 230	$ 440	$ 1,760	$ 2,789

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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