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Note 6 - Supplemental Balance Sheet Information - Composition of Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 29, 2019
Dec. 31, 2018
Cost $ 19,622 $ 16,109
Accumulated Amortization 9,939 9,605
Net 9,683 6,504
Trademarks [Member]    
Cost 3,401 3,405
Accumulated Amortization 0 0
Net 3,401 3,405
Customer Relationships [Member]    
Cost 8,907 6,471
Accumulated Amortization 4,586 4,392
Net 4,321 2,079
Patented Technology [Member]    
Cost 5,452 5,486
Accumulated Amortization 4,810 4,725
Net 642 761
Distributor Relationships [Member]    
Cost 377 377
Accumulated Amortization 377 377
Net
Trade Names [Member]    
Cost 1,485 370
Accumulated Amortization 166 111
Net $ 1,319 $ 259