Note 17 - Segment Data - Net Sales by Market (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net sales	$ 36,507	$ 37,220	$ 37,902	$ 34,503	$ 33,933	$ 34,441	$ 36,499	$ 33,977	$ 146,132	$ 138,850	$ 139,307
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Percentage of concentration risk									100.00%	100.00%	100.00%
Medical [Member]
Net sales									$ 64,522	$ 57,297	$ 50,092
Medical [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Percentage of concentration risk									44.20%	41.30%	36.00%
Automotive [Member]
Net sales									$ 27,450	$ 26,879	$ 27,358
Automotive [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Percentage of concentration risk									18.80%	19.40%	19.60%
Consumer [Member]
Net sales									$ 21,419	$ 17,274	$ 17,661
Consumer [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Percentage of concentration risk									14.70%	12.40%	12.70%
Electronics [Member]
Net sales									$ 11,586	$ 13,218	$ 15,830
Electronics [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Percentage of concentration risk									7.90%	9.50%	11.40%
Industrial [Member]
Net sales									$ 10,661	$ 11,028	$ 13,208
Industrial [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Percentage of concentration risk									7.30%	7.90%	9.50%
Aerospace & Defense [Member]
Net sales									$ 10,494	$ 13,154	$ 15,158
Aerospace & Defense [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Percentage of concentration risk									7.20%	9.50%	10.90%