Note 3 - Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net sales	$ 30,058	$ 29,558	$ 85,515	$ 84,543
Medical [Member]
Net sales	17,043		46,006
Industrial [Member]
Net sales	8,623		26,290
Aerospace and Defense [Member]
Net sales	4,392		13,219
Transferred over Time [Member]
Net sales	25,656		77,122
Transferred over Time [Member] | Medical [Member]
Net sales	14,399		42,039
Transferred over Time [Member] | Industrial [Member]
Net sales	7,279		22,847
Transferred over Time [Member] | Aerospace and Defense [Member]
Net sales	3,978		12,236
Transferred at Point in Time [Member]
Net sales	2,616		4,586
Transferred at Point in Time [Member] | Medical [Member]
Net sales	1,661		1,914
Transferred at Point in Time [Member] | Industrial [Member]
Net sales	822		2,297
Transferred at Point in Time [Member] | Aerospace and Defense [Member]
Net sales	133		375
Noncash Consideration [Member]
Net sales	1,786		3,807
Noncash Consideration [Member] | Medical [Member]
Net sales	983		2,053
Noncash Consideration [Member] | Industrial [Member]
Net sales	522		1,146
Noncash Consideration [Member] | Aerospace and Defense [Member]
Net sales	$ 281		$ 608