Note 9 - Segment Reporting - Net Sales by Market (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net sales	$ 49,019	$ 37,886	$ 91,949	$ 74,939
Percentage of concentration risk	100.00%	100.00%	100.00%	100.00%
Medical [Member]
Net sales	$ 29,229	$ 18,707	$ 53,367	$ 36,188
Percentage of concentration risk	59.60%	49.40%	58.00%	48.30%
Consumer [Member]
Net sales	$ 5,777	$ 4,773	$ 11,237	$ 9,214
Percentage of concentration risk	11.80%	12.60%	12.20%	12.30%
Automotive [Member]
Net sales	$ 5,065	$ 6,125	$ 10,421	$ 12,844
Percentage of concentration risk	10.30%	16.20%	11.30%	17.10%
Aerospace & Defense [Member]
Net sales	$ 3,080	$ 2,556	$ 5,567	$ 5,599
Percentage of concentration risk	6.30%	6.70%	6.10%	7.50%
Electronics [Member]
Net sales	$ 2,968	$ 3,165	$ 5,840	$ 6,077
Percentage of concentration risk	6.10%	8.40%	6.40%	8.10%
Industrial [Member]
Net sales	$ 2,900	$ 2,560	$ 5,517	$ 5,017
Percentage of concentration risk	5.90%	6.80%	6.00%	6.70%