Note 3 - Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net sales	$ 26,362	$ 30,058	$ 80,263	$ 85,515
Medical [Member]
Net sales	14,218	17,043	42,753	46,006
Industrial [Member]
Net sales	5,938	8,623	22,001	26,290
Aerospace and Defense [Member]
Net sales	6,206	4,392	15,509	13,219
Transferred over Time [Member]
Net sales	21,012	25,656	67,429	77,122
Transferred over Time [Member] | Medical [Member]
Net sales	10,960	14,399	35,835	42,039
Transferred over Time [Member] | Industrial [Member]
Net sales	4,527	7,279	17,434	22,847
Transferred over Time [Member] | Aerospace and Defense [Member]
Net sales	5,525	3,978	14,160	12,236
Transferred at Point in Time [Member]
Net sales	2,660	2,616	8,204	4,586
Transferred at Point in Time [Member] | Medical [Member]
Net sales	1,853	1,661	4,454	1,914
Transferred at Point in Time [Member] | Industrial [Member]
Net sales	791	822	3,354	2,297
Transferred at Point in Time [Member] | Aerospace and Defense [Member]
Net sales	16	133	396	375
Noncash Consideration [Member]
Net sales	2,690	1,786	4,630	3,807
Noncash Consideration [Member] | Medical [Member]
Net sales	1,405	983	2,464	2,053
Noncash Consideration [Member] | Industrial [Member]
Net sales	620	522	1,213	1,146
Noncash Consideration [Member] | Aerospace and Defense [Member]
Net sales	$ 665	$ 281	$ 953	$ 608