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Note 18 - Segment Data - Net Sales by Market (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net sales $ 50,697 $ 47,808 $ 49,019 $ 42,931 $ 37,220 $ 35,684 $ 37,886 $ 37,053 $ 190,455 $ 147,843 $ 146,132
Percentage of concentration risk                 100.00% 100.00% 100.00%
Medical [Member]                      
Net sales                 $ 110,282 $ 70,087 $ 64,733
Percentage of concentration risk                 57.90% 47.40% 44.30%
Consumer [Member]                      
Net sales                 $ 24,989 $ 21,328 $ 20,721
Percentage of concentration risk                 13.10% 14.40% 14.20%
Automotive [Member]                      
Net sales                 $ 20,012 $ 23,118 $ 27,255
Percentage of concentration risk                 10.50% 15.60% 18.70%
Aerospace & Defense [Member]                      
Net sales                 $ 13,133 $ 11,521 $ 10,951
Percentage of concentration risk                 6.90% 7.80% 7.50%
Electronics [Member]                      
Net sales                 $ 11,453 $ 11,960 $ 11,675
Percentage of concentration risk                 6.00% 8.10% 8.00%
Industrial [Member]                      
Net sales                 $ 10,586 $ 9,829 $ 10,797
Percentage of concentration risk                 5.60% 6.60% 7.40%