Note 3 - Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net sales	$ 27,440	$ 28,165
Medical [Member]
Net sales	15,461	14,939
Industrial [Member]
Net sales	7,309	8,981
Aerospace and Defense [Member]
Net sales	4,670	4,245
Transferred over Time [Member]
Net sales	24,036	26,738
Transferred over Time [Member] | Medical [Member]
Net sales	13,703	14,495
Transferred over Time [Member] | Industrial [Member]
Net sales	6,016	8,140
Transferred over Time [Member] | Aerospace and Defense [Member]
Net sales	4,317	4,103
Transferred at Point in Time [Member]
Net sales	2,165	652
Transferred at Point in Time [Member] | Medical [Member]
Net sales	1,061	35
Transferred at Point in Time [Member] | Industrial [Member]
Net sales	970	597
Transferred at Point in Time [Member] | Aerospace and Defense [Member]
Net sales	134	20
Noncash Consideration [Member]
Net sales	1,239	775
Noncash Consideration [Member] | Medical [Member]
Net sales	697	409
Noncash Consideration [Member] | Industrial [Member]
Net sales	323	244
Noncash Consideration [Member] | Aerospace and Defense [Member]
Net sales	$ 219	$ 122