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Note 8 - Segment Reporting - Net Sales by Market (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Net sales $ 35,684 $ 37,220 $ 110,623 $ 109,626
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]        
Percentage of concentration risk 100.00% 100.00% 100.00% 100.00%
Medical [Member]        
Net sales $ 16,712 $ 16,548 $ 52,822 $ 48,953
Medical [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]        
Percentage of concentration risk 46.80% 44.50% 47.70% 44.70%
Consumer [Member]        
Net sales $ 6,006 $ 5,648 $ 15,713 $ 15,303
Consumer [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]        
Percentage of concentration risk 16.80% 15.20% 14.20% 14.00%
Automotive [Member]        
Net sales $ 5,174 $ 6,942 $ 18,018 $ 20,485
Automotive [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]        
Percentage of concentration risk 14.50% 18.70% 16.30% 18.70%
Aerospace & Defense [Member]        
Net sales $ 2,682 $ 2,516 $ 8,290 $ 7,929
Aerospace & Defense [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]        
Percentage of concentration risk 7.50% 6.80% 7.50% 7.20%
Industrial [Member]        
Net sales $ 2,591 $ 2,792 $ 7,629 $ 8,441
Industrial [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]        
Percentage of concentration risk 7.30% 7.50% 6.90% 7.70%
Electronics [Member]        
Net sales $ 2,519 $ 2,774 $ 8,151 $ 8,515
Electronics [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]        
Percentage of concentration risk 7.10% 7.50% 7.40% 7.80%