Note 3 - Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net sales	$ 27,292	$ 28,538	$ 55,457	$ 54,985
Aerospace and Defense [Member]
Net sales	4,582		8,827
Medical [Member]
Net sales	14,024		28,963
Industrial [Member]
Net sales	8,686		17,667
Transferred over Time [Member]
Net sales	24,728		51,466
Transferred over Time [Member] | Aerospace and Defense [Member]
Net sales	4,155		8,258
Transferred over Time [Member] | Medical [Member]
Net sales	13,145		27,640
Transferred over Time [Member] | Industrial [Member]
Net sales	7,428		15,568
Transferred at Point in Time [Member]
Net sales	1,318		1,970
Transferred at Point in Time [Member] | Aerospace and Defense [Member]
Net sales	222		242
Transferred at Point in Time [Member] | Medical [Member]
Net sales	218		253
Transferred at Point in Time [Member] | Industrial [Member]
Net sales	878		1,475
Noncash Consideration [Member]
Net sales	1,246		2,021
Noncash Consideration [Member] | Aerospace and Defense [Member]
Net sales	205		327
Noncash Consideration [Member] | Medical [Member]
Net sales	661		1,070
Noncash Consideration [Member] | Industrial [Member]
Net sales	$ 380		$ 624