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Note 4 - Supplemental Balance Sheet Information - Composition of Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Cost $ 28,214 $ 28,247
Accumulated Amortization 13,347 13,140
Net 14,867 15,107
Customer Relationships [Member]    
Cost 13,072 13,092
Accumulated Amortization 6,796 6,656
Net 6,276 6,436
Patented Technology [Member]    
Cost 5,597 5,606
Accumulated Amortization 5,344 5,322
Net 253 284
Trade Names [Member]    
Cost 4,645 4,647
Accumulated Amortization 673 647
Net 3,972 4,000
Trademarks [Member]    
Cost 3,400 3,402
Accumulated Amortization 0 0
Net 3,400 3,402
Other Intangible Assets [Member]    
Cost 1,500 1,500
Accumulated Amortization 534 515
Net $ 966 $ 985