Note 3 - Business Combinations (Details) - Allocation of Purchase Prices of Acquisitions (USD $) In Thousands, unless otherwise specified	6 Months Ended		1 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Apr. 23, 2014 FineLine Prototyping, Inc. [Member]	Jun. 30, 2014 FineLine Prototyping, Inc. [Member]
Assets acquired:
Current assets			$ 1,248
Intangible assets			4,580
Goodwill	28,916	0	28,916
Other long-term assets			3,849
Total assets acquired			38,593
Liabilities assumed:
Current liabilities			1,729
Total liabilities assumed			1,729
Net assets acquired			36,864
Cash paid			34,468
Cash acquired			(604)
Net cash consideration	33,864		33,864
Contingent consideration			3,000	2,600
Total purchase consideration			$ 36,864