Note 1 - Summary of Significant Accounting Policies - Net Sales (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Net sales	$ 104,106	$ 116,333
Medical [Member]
Net sales	55,098	62,612
Aerospace and Defense [Member]
Net sales	20,624	18,207
Industrial [Member]
Net sales	$ 28,384	$ 35,514