Note 3 - Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net sales	$ 29,452	$ 26,362	$ 81,706	$ 80,263
Medical [Member]
Net sales	16,977	14,218	45,390	42,753
Aerospace and Defense [Member]
Net sales	3,092	6,206	10,539	15,509
Industrial [Member]
Net sales	9,383	5,938	25,777	22,001
Transferred over Time [Member]
Net sales	24,113	21,012	65,567	67,429
Transferred over Time [Member] | Medical [Member]
Net sales	13,762	10,960	35,497	35,835
Transferred over Time [Member] | Aerospace and Defense [Member]
Net sales	2,883	5,525	9,685	14,160
Transferred over Time [Member] | Industrial [Member]
Net sales	7,468	4,527	20,385	17,434
Transferred at Point in Time [Member]
Net sales	4,834	2,660	14,235	8,204
Transferred at Point in Time [Member] | Medical [Member]
Net sales	2,933	1,853	8,876	4,454
Transferred at Point in Time [Member] | Aerospace and Defense [Member]
Net sales	144	16	527	396
Transferred at Point in Time [Member] | Industrial [Member]
Net sales	1,757	791	4,832	3,354
Noncash Consideration [Member]
Net sales	505	2,690	1,904	4,630
Noncash Consideration [Member] | Medical [Member]
Net sales	282	1,405	1,017	2,464
Noncash Consideration [Member] | Aerospace and Defense [Member]
Net sales	65	665	327	953
Noncash Consideration [Member] | Industrial [Member]
Net sales	$ 158	$ 620	$ 560	$ 1,213