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Note 4 - Supplemental Balance Sheet Information - Composition of Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Cost | $ 28,084 | $ 28,060
Accumulated Amortization | 12,814 | 12,139
Net | 15,270 | 15,921
Customer Relationships [Member] |  |
Cost | 12,989 | 12,970
Accumulated Amortization | 6,451 | 5,992
Net | 6,538 | 6,978
Patented Technology [Member] |  |
Cost | 5,564 | 5,557
Accumulated Amortization | 5,260 | 5,171
Net | 304 | 386
Trade Names [Member] |  |
Cost | 4,632 | 4,629
Accumulated Amortization | 607 | 522
Net | 4,025 | 4,107
Trademarks [Member] |  |
Cost | 3,399 | 3,404
Accumulated Amortization | 0 | 0
Net | 3,399 | 3,404
Other Intangible Assets [Member] |  |
Cost | 1,500 | 1,500
Accumulated Amortization | 496 | 454
Net | $ 1,004 | $ 1,046

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