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Note 4 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenues	$ 105,984	$ 108,435
Grid [Member]
Revenues	94,631	98,876
Grid [Member] | Americas [Member]
Revenues	67,664	73,955
Grid [Member] | Asia Pacific [Member]
Revenues	20,326	19,397
Grid [Member] | EMEA [Member]
Revenues	6,641	5,524
Wind [Member]
Revenues	11,353	9,559
Wind [Member] | Americas [Member]
Revenues	19	145
Wind [Member] | Asia Pacific [Member]
Revenues	11,199	9,346
Wind [Member] | EMEA [Member]
Revenues	135	68
Equipment and Systems [Member] | Grid [Member]
Revenues	88,311	91,704
Equipment and Systems [Member] | Wind [Member]
Revenues	9,282	6,169
Services and Technology Development [Member] | Grid [Member]
Revenues	6,320	7,172
Services and Technology Development [Member] | Wind [Member]
Revenues	$ 2,071	$ 3,390

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
-Topic 924
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-42

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Section 50
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Name Accounting Standards Codification
-Section 50
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-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-41

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-4

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