Note 8 - Segment Reporting - Net Sales by Market (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Medical [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Percentage of concentration risk	44.30%	40.10%	44.60%	40.60%
Medical [Member]
Net sales	$ 16,492	$ 13,809	$ 48,931	$ 42,595
Automotive [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Percentage of concentration risk	18.70%	18.20%	18.90%	20.20%
Automotive [Member]
Net sales	$ 6,944	$ 6,258	$ 20,718	$ 21,193
Consumer [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Percentage of concentration risk	15.00%	13.70%	13.80%	11.80%
Consumer [Member]
Net sales	$ 5,580	$ 4,710	$ 15,171	$ 12,385
Electronics [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Percentage of concentration risk	8.00%	10.00%	8.30%	10.00%
Electronics [Member]
Net sales	$ 2,992	$ 3,427	$ 9,055	$ 10,538
Industrial [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Percentage of concentration risk	7.50%	8.30%	7.60%	7.70%
Industrial [Member]
Net sales	$ 2,802	$ 2,856	$ 8,281	$ 8,120
Aerospace & Defense [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Percentage of concentration risk	6.50%	9.80%	6.80%	9.60%
Aerospace & Defense [Member]
Net sales	$ 2,410	$ 3,381	$ 7,470	$ 10,086
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Percentage of concentration risk	100.00%	100.00%	100.00%	100.00%
Net sales	$ 37,220	$ 34,441	$ 109,626	$ 104,917