Note 3 - Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net sales	$ 26,461	$ 27,292	$ 53,901	$ 55,457
Medical [Member]
Net sales	13,371	14,024	28,733	28,963
Aerospace and Defense [Member]
Net sales	4,906	4,582	9,690	8,827
Industrial [Member]
Net sales	8,184	8,686	15,478	17,667
Transferred over Time [Member]
Net sales	22,381	24,728	46,418	51,466
Transferred over Time [Member] | Medical [Member]
Net sales	11,464	13,145	25,084	27,640
Transferred over Time [Member] | Aerospace and Defense [Member]
Net sales	4,522	4,155	8,944	8,258
Transferred over Time [Member] | Industrial [Member]
Net sales	6,395	7,428	12,390	15,568
Transferred at Point in Time [Member]
Net sales	3,379	1,318	5,543	1,970
Transferred at Point in Time [Member] | Medical [Member]
Net sales	1,540	218	2,601	253
Transferred at Point in Time [Member] | Aerospace and Defense [Member]
Net sales	246	222	379	242
Transferred at Point in Time [Member] | Industrial [Member]
Net sales	1,593	878	2,563	1,475
Noncash Consideration [Member]
Net sales	701	1,246	1,940	2,021
Noncash Consideration [Member] | Medical [Member]
Net sales	367	661	1,048	1,070
Noncash Consideration [Member] | Aerospace and Defense [Member]
Net sales	138	205	367	327
Noncash Consideration [Member] | Industrial [Member]
Net sales	$ 196	$ 380	$ 525	$ 624