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Note 9 - Segment Reporting - Net Sales by Market (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Net sales $ 47,328 $ 42,931
Percentage of concentration risk 100.00% 100.00%
Medical [Member]    
Net sales $ 28,813 $ 24,138
Percentage of concentration risk 60.90% 56.20%
Automotive [Member]    
Net sales $ 5,738 $ 5,356
Percentage of concentration risk 12.10% 12.50%
Consumer [Member]    
Net sales $ 4,416 $ 5,460
Percentage of concentration risk 9.30% 12.70%
Aerospace & Defense [Member]    
Net sales $ 3,532 $ 2,487
Percentage of concentration risk 7.50% 5.80%
Industrial [Member]    
Net sales $ 2,625 $ 2,618
Percentage of concentration risk 5.50% 6.10%
Electronics [Member]    
Net sales $ 2,204 $ 2,872
Percentage of concentration risk 4.70% 6.70%