Note 3 - Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net sales	$ 22,072	$ 27,440
Medical [Member]
Net sales	12,342	15,461
Industrial [Member]
Net sales	6,218	7,309
Aerospace and Defense [Member]
Net sales	3,512	4,670
Transferred over Time [Member]
Net sales	16,653	24,036
Transferred over Time [Member] | Medical [Member]
Net sales	8,959	13,703
Transferred over Time [Member] | Industrial [Member]
Net sales	4,630	6,016
Transferred over Time [Member] | Aerospace and Defense [Member]
Net sales	3,064	4,317
Transferred at Point in Time [Member]
Net sales	4,491	2,165
Transferred at Point in Time [Member] | Medical [Member]
Net sales	2,893	1,061
Transferred at Point in Time [Member] | Industrial [Member]
Net sales	1,336	970
Transferred at Point in Time [Member] | Aerospace and Defense [Member]
Net sales	262	134
Noncash Consideration [Member]
Net sales	928	1,239
Noncash Consideration [Member] | Medical [Member]
Net sales	490	697
Noncash Consideration [Member] | Industrial [Member]
Net sales	252	323
Noncash Consideration [Member] | Aerospace and Defense [Member]
Net sales	$ 186	$ 219