Note 9 - Segment Reporting - Net Sales by Market (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net sales	$ 51,399	$ 49,019	$ 98,726	$ 91,949
Percentage of concentration risk	100.00%	100.00%	100.00%	100.00%
Medical [Member]
Net sales	$ 33,045	$ 29,227	$ 61,989	$ 53,365
Percentage of concentration risk	64.30%	59.60%	62.80%	58.00%
Automotive [Member]
Net sales	$ 4,950	$ 5,065	$ 10,688	$ 10,421
Percentage of concentration risk	9.60%	10.30%	10.80%	11.30%
Consumer [Member]
Net sales	$ 4,667	$ 5,777	$ 9,092	$ 11,237
Percentage of concentration risk	9.10%	11.80%	9.20%	12.20%
Aerospace & Defense [Member]
Net sales	$ 4,115	$ 3,080	$ 7,646	$ 5,567
Percentage of concentration risk	8.00%	6.30%	7.70%	6.10%
Industrial [Member]
Net sales	$ 2,326	$ 2,902	$ 4,811	$ 5,519
Percentage of concentration risk	4.50%	5.90%	4.90%	6.00%
Electronics [Member]
Net sales	$ 2,296	$ 2,968	$ 4,500	$ 5,840
Percentage of concentration risk	4.50%	6.10%	4.60%	6.40%