Note 17 - Total Revenue by Product Line (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Injection Molding (Protomold) [Member]
Revenues	$ 163,387	$ 140,282	$ 115,069
CNC Machining (Firstcut) [Member]
Revenues	74,368	59,914	$ 48,043
3D Printing (Fineline) [Member]
Revenues	25,132	$ 9,387
Other Products [Member]
Revenues	1,219
Revenues	$ 264,106	$ 209,583	$ 163,112