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Note 17 - Segment Data - Net Sales by Market (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net sales $ 50,260 $ 49,394 $ 51,399 $ 47,328 $ 50,697 $ 47,808 $ 49,019 $ 42,931 $ 198,381 $ 190,455 $ 147,843
Percentage of concentration risk                 100.00% 100.00% 100.00%
Medical [Member]                      
Net sales                 $ 128,915 $ 110,282 $ 70,090
Percentage of concentration risk                 65.00% 57.90% 47.40%
Automotive [Member]                      
Net sales                 $ 20,004 $ 20,022 $ 23,119
Percentage of concentration risk                 10.10% 10.50% 15.60%
Consumer [Member]                      
Net sales                 $ 17,669 $ 24,989 $ 21,328
Percentage of concentration risk                 8.90% 13.10% 14.40%
Aerospace & Defense [Member]                      
Net sales                 $ 13,778 $ 13,130 $ 11,521
Percentage of concentration risk                 6.90% 6.90% 7.80%
Industrial [Member]                      
Net sales                 $ 9,607 $ 10,579 $ 9,826
Percentage of concentration risk                 4.80% 5.60% 6.60%
Electronics [Member]                      
Net sales                 $ 8,408 $ 11,453 $ 11,959
Percentage of concentration risk                 4.20% 6.00% 8.10%