Note 3 - Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net sales	$ 30,182	$ 26,461	$ 52,254	$ 53,901
Medical [Member]
Net sales	16,070	13,371	28,411	28,733
Aerospace and Defense [Member]
Net sales	3,936	4,906	7,448	9,690
Industrial [Member]
Net sales	10,176	8,184	16,395	15,478
Transferred over Time [Member]
Net sales	24,801	22,381	41,454	46,418
Transferred over Time [Member] | Medical [Member]
Net sales	12,776	11,464	21,735	25,084
Transferred over Time [Member] | Aerospace and Defense [Member]
Net sales	3,738	4,522	6,802	8,944
Transferred over Time [Member] | Industrial [Member]
Net sales	8,287	6,395	12,917	12,390
Transferred at Point in Time [Member]
Net sales	4,910	3,379	9,401	5,543
Transferred at Point in Time [Member] | Medical [Member]
Net sales	3,050	1,540	5,942	2,601
Transferred at Point in Time [Member] | Aerospace and Defense [Member]
Net sales	122	246	384	379
Transferred at Point in Time [Member] | Industrial [Member]
Net sales	1,738	1,593	3,075	2,563
Noncash Consideration [Member]
Net sales	471	701	1,399	1,940
Noncash Consideration [Member] | Medical [Member]
Net sales	244	367	734	1,048
Noncash Consideration [Member] | Aerospace and Defense [Member]
Net sales	76	138	262	367
Noncash Consideration [Member] | Industrial [Member]
Net sales	$ 151	$ 196	$ 403	$ 525