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Note 8 - Segment Reporting - Net Sales by Market (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Net sales $ 37,053 $ 34,503
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]    
Percentage of concentration risk 100.00% 100.00%
Medical [Member]    
Net sales $ 17,459 $ 15,614
Medical [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]    
Percentage of concentration risk 47.10% 45.30%
Automotive [Member]    
Net sales $ 6,719 $ 6,089
Automotive [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]    
Percentage of concentration risk 18.10% 17.60%
Consumer [Member]    
Net sales $ 4,692 $ 4,629
Consumer [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]    
Percentage of concentration risk 12.70% 13.40%
Aerospace & Defense [Member]    
Net sales $ 3,041 $ 2,572
Aerospace & Defense [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]    
Percentage of concentration risk 8.20% 7.50%
Electronics [Member]    
Net sales $ 2,692 $ 2,867
Electronics [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]    
Percentage of concentration risk 7.30% 8.30%
Industrial [Member]    
Net sales $ 2,450 $ 2,732
Industrial [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]    
Percentage of concentration risk 6.60% 7.90%