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Note 5 - Goodwill and Other Intangibles - Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023
Accumulated Amortization	$ (13,678)	$ (13,134)
Net Book Value	6,183
Intangible assets, gross amount	21,661	21,661
Intangible assets, net	7,983	8,527
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	(681)	(675)
Net Book Value	0	$ 6
Estimated Useful Life (Year)		2 years
Customer Relationships [Member]
Gross Amount	9,600	$ 9,600
Accumulated Amortization	(5,397)	(4,980)
Net Book Value	4,203	$ 4,620
Estimated Useful Life (Year)		7 years
Core Technology and Know-how [Member]
Gross Amount	5,970	$ 5,970
Accumulated Amortization	(3,990)	(3,869)
Net Book Value	$ 1,980	$ 2,101
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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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(16))
-Publisher FASB
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-Topic 350
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-Section 50
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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
-Topic 928
-SubTopic 340
-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 926
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
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-Section S99
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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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