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Note 5 - Supplemental Balance Sheet Information - Composition of Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Cost $ 19,631 $ 19,892
Accumulated Amortization 10,381 10,171
Net 9,250 9,721
Trademarks [Member]    
Cost 3,401 3,403
Accumulated Amortization 0 0
Net 3,401 3,403
Customer Relationships [Member]    
Cost 8,913 9,080
Accumulated Amortization 4,853 4,721
Net 4,060 4,359
Patented Technology [Member]    
Cost 5,454 5,521
Accumulated Amortization 4,902 4,869
Net 552 652
Distributor Relationships [Member]    
Cost 377 377
Accumulated Amortization 377 377
Net 0 0
Trade Names [Member]    
Cost 1,486 1,511
Accumulated Amortization 249 204
Net $ 1,237 $ 1,307