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Note 3 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Revenues	$ 22,679	$ 25,420
Grid [Member]
Revenues	19,829	23,501
Grid [Member] | Americas [Member]
Revenues	16,902	22,645
Grid [Member] | Asia Pacific [Member]
Revenues	2,677	598
Grid [Member] | EMEA [Member]
Revenues	250	258
Wind [Member]
Revenues	2,850	1,919
Wind [Member] | Americas [Member]
Revenues	0	19
Wind [Member] | Asia Pacific [Member]
Revenues	2,850	1,870
Wind [Member] | EMEA [Member]
Revenues	0	30
Equipment and Systems [Member] | Grid [Member]
Revenues	18,077	21,159
Equipment and Systems [Member] | Wind [Member]
Revenues	1,973	1,033
Services and Technology Development [Member] | Grid [Member]
Revenues	1,753	2,342
Services and Technology Development [Member] | Wind [Member]
Revenues	$ 877	$ 886

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 924
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-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-URI https://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856

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