Note 3 - Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Net sales	$ 104,106	$ 116,333
Medical [Member]
Net sales	55,098	62,612
Aerospace and Defense [Member]
Net sales	20,624	18,207
Industrial [Member]
Net sales	28,384	35,514
Transferred over Time [Member]
Net sales	87,093	104,454
Transferred over Time [Member] | Medical [Member]
Net sales	45,694	56,760
Transferred over Time [Member] | Aerospace and Defense [Member]
Net sales	18,948	16,892
Transferred over Time [Member] | Industrial [Member]
Net sales	22,451	30,802
Transferred at Point in Time [Member]
Net sales	11,296	6,627
Transferred at Point in Time [Member] | Medical [Member]
Net sales	6,398	3,021
Transferred at Point in Time [Member] | Aerospace and Defense [Member]
Net sales	454	462
Transferred at Point in Time [Member] | Industrial [Member]
Net sales	4,444	3,144
Noncash Consideration [Member]
Net sales	5,717	5,252
Noncash Consideration [Member] | Medical [Member]
Net sales	3,006	2,831
Noncash Consideration [Member] | Aerospace and Defense [Member]
Net sales	1,222	853
Noncash Consideration [Member] | Industrial [Member]
Net sales	$ 1,489	$ 1,568