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Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenues	$ 34,004	$ 27,680	$ 64,258	$ 50,360
Grid [Member]
Revenues	28,515	25,698	54,251	45,527
Grid [Member] | Americas [Member]
Revenues	24,696	18,021	47,856	34,923
Grid [Member] | Asia Pacific [Member]
Revenues	3,418	6,178	5,129	8,855
Grid [Member] | EMEA [Member]
Revenues	401	1,499	1,266	1,749
Wind [Member]
Revenues	5,489	1,982	10,007	4,833
Wind [Member] | Americas [Member]
Revenues	27	0	57	0
Wind [Member] | Asia Pacific [Member]
Revenues	5,462	1,912	9,928	4,763
Wind [Member] | EMEA [Member]
Revenues	0	70	22	70
Equipment and Systems [Member] | Grid [Member]
Revenues	22,682	24,128	45,808	42,204
Equipment and Systems [Member] | Wind [Member]
Revenues	4,879	1,330	8,862	3,302
Services and Technology Development [Member] | Grid [Member]
Revenues	5,833	1,570	8,443	3,323
Services and Technology Development [Member] | Wind [Member]
Revenues	$ 610	$ 652	$ 1,145	$ 1,531

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
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-Name Accounting Standards Codification
-Section S99
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479941/924-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-URI https://asc.fasb.org//1943274/2147479806/606-10-50-5

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-URI https://asc.fasb.org//1943274/2147482810/280-10-50-30

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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-URI https://asc.fasb.org//1943274/2147482810/280-10-50-22

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
-Paragraph 40
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-40

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-URI https://asc.fasb.org//1943274/2147482810/280-10-50-22

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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-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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-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-4

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