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Note 8 - Segment Reporting - Net Sales by Market (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Net sales $ 37,886 $ 37,902 $ 74,939 $ 72,406
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]        
Percentage of concentration risk 100.00% 100.00% 100.00% 100.00%
Medical [Member]        
Net sales $ 18,654 $ 16,790 $ 36,115 $ 32,404
Medical [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]        
Percentage of concentration risk 49.20% 44.30% 48.20% 44.80%
Automotive [Member]        
Net sales $ 6,125 $ 7,454 $ 12,843 $ 13,543
Automotive [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]        
Percentage of concentration risk 16.20% 19.70% 17.10% 18.70%
Consumer [Member]        
Net sales $ 5,015 $ 5,025 $ 9,707 $ 9,655
Consumer [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]        
Percentage of concentration risk 13.20% 13.30% 13.00% 13.30%
Electronics [Member]        
Net sales $ 2,942 $ 2,874 $ 5,635 $ 5,741
Electronics [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]        
Percentage of concentration risk 7.80% 7.60% 7.50% 7.90%
Industrial [Member]        
Net sales $ 2,602 $ 2,918 $ 5,036 $ 5,650
Industrial [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]        
Percentage of concentration risk 6.90% 7.70% 6.70% 7.80%
Aerospace & Defense [Member]        
Net sales $ 2,548 $ 2,841 $ 5,603 $ 5,413
Aerospace & Defense [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]        
Percentage of concentration risk 6.70% 7.50% 7.50% 7.50%