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Note 10 - Segment Reporting - Net Sales by Market (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Net sales $ 43,299 $ 49,394 $ 134,220 $ 148,120
Percentage of concentration risk 100.00% 100.00% 100.00% 100.00%
Medical [Member]        
Net sales $ 26,850 $ 32,175 $ 92,195 $ 94,164
Percentage of concentration risk 62.00% 65.10% 68.70% 63.60%
Consumer [Member]        
Net sales $ 5,566 $ 4,602 $ 12,185 $ 13,693
Percentage of concentration risk 12.90% 9.30% 9.10% 9.20%
Automotive [Member]        
Net sales $ 4,473 $ 4,946 $ 10,525 $ 15,634
Percentage of concentration risk 10.30% 10.00% 7.80% 10.60%
Aerospace & Defense [Member]        
Net sales $ 3,356 $ 3,246 $ 9,102 $ 10,893
Percentage of concentration risk 7.80% 6.60% 6.80% 7.40%
Industrial [Member]        
Net sales $ 1,758 $ 2,421 $ 5,817 $ 7,232
Percentage of concentration risk 4.10% 4.90% 4.20% 4.90%
Electronics [Member]        
Net sales $ 1,296 $ 2,004 $ 4,396 $ 6,504
Percentage of concentration risk 3.00% 4.10% 3.30% 4.40%