Note 3 - Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue:
Revenue	$ 488,098	$ 434,395	$ 458,728
Injection Molding (Protomold) [Member]
Revenue:
Revenue	226,117	217,992	217,415
CNC Machining (Firstcut) [Member]
Revenue:
Revenue	166,811	131,587	155,473
3D Printing (Fineline) [Member]
Revenue:
Revenue	72,721	62,502	61,352
Sheet Metal [Member]
Revenue:
Revenue	20,397	18,838	21,000
Other Products [Member]
Revenue:
Revenue	2,052	3,476	3,488
UNITED STATES
Revenue:
Revenue	384,458	345,708	360,205
Europe [Member]
Revenue:
Revenue	90,399	74,796	82,805
JAPAN
Revenue:
Revenue	$ 13,241	$ 13,891	$ 15,718