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Note 5 - Goodwill and Other Intangibles - Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Mar. 31, 2023
--- | --- | ---
Accumulated Amortization | $ (10,606) | $ (9,524)
Net Book Value | 5,645 |
Intangible assets, gross amount | 18,051 | 18,051
Intangible assets, net | 7,445 | 8,527
Trade Names [Member] |  |
Trade name and trademarks | 1,800 | 1,800
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 | (5,815) | (4,980)
Net Book Value | $ 3,785 | 4,620
Estimated Useful Life (Year) | 7 years |
Core Technology and Know-how [Member] |  |
Gross Amount | $ 5,970 | 5,970
Accumulated Amortization | (4,110) | (3,869)
Net Book Value | $ 1,860 | $ 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 |

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- 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 No definition available. + Details
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- Definition 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 -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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- Definition Amount before 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 928 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483147/928-340-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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