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Note 6 - Goodwill and Other Intangibles - Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2022	Mar. 31, 2022
Accumulated Amortization	$ (11,750)	$ (10,350)
Net Book Value	8,111
Intangible assets, gross amount	21,661	21,661
Intangible assets, net	9,911	11,311
Trade Names [Member]
Trade name and trademarks	1,800	1,800
Licensing Agreements [Member]
Gross Amount	3,610	3,610
Accumulated Amortization	(3,610)	(3,610)
Net Book Value	$ 0	0
Estimated Useful Life (Year)	7 years
Backlog [Member]
Gross Amount	$ 681	681
Accumulated Amortization	(668)	(631)
Net Book Value	$ 13	50
Estimated Useful Life (Year)	2 years
Customer Relationships [Member]
Gross Amount	$ 9,600	9,600
Accumulated Amortization	(3,845)	(2,723)
Net Book Value	$ 5,755	6,877
Estimated Useful Life (Year)	7 years
Core Technology and Know-how [Member]
Gross Amount	$ 5,970	5,970
Accumulated Amortization	(3,627)	(3,386)
Net Book Value	$ 2,343	$ 2,584
Core Technology and Know-how [Member] | Minimum [Member]
Estimated Useful Life (Year)	5 years
Core Technology and Know-how [Member] | Maximum [Member]
Estimated Useful Life (Year)	10 years

X

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(16))
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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
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-Topic 210
-SubTopic 10
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