Note 11 - Revenue and Geographic Information - Total Revenue by Product Line (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Protomold [Member]
Revenue:
Revenues	$ 39,932	$ 36,255	$ 77,550	$ 68,949
First Cut [Member]
Revenue:
Revenues	18,585	14,478	34,955	27,858
Fineline [Member]
Revenue:
Revenues	5,452	2,133	10,000	2,133
Revenues	$ 63,969	$ 52,866	$ 122,505	$ 98,940

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Name:	us-gaap_SalesRevenueNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration