Note 5 - Business Combinations (Details Textual) - USD ($) $ in Thousands		11 Months Ended	12 Months Ended
	Jan. 22, 2021	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Payments to Acquire Businesses, Net of Cash Acquired, Total			$ 127,413	$ (0)	$ (0)
Business Combination, Contingent Consideration, Liability, Total		$ 0	0
Acquired 3D Hubs [Member]
Business Combination, Consideration Transferred, Total	$ 294,100		294,122
Payments to Acquire Businesses, Net of Cash Acquired, Total	$ 127,400		127,413
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)	863,995
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	$ 166,700		166,709
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	52,800
Payments to Acquire Businesses, Gross			133,847
Business Combination, Contingent Consideration, Liability, Total	$ 13,600
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles			(3,900)
Goodwill, Purchase Accounting Adjustments			5,500
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Contingent Consideration			3,300
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Tax Liabilities			1,400
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Cash Paid			$ (300)
Acquired 3D Hubs [Member] | Cash [Member]
Payments to Acquire Businesses, Gross		$ 25,000
Acquired 3D Hubs [Member] | Common Stock [Member] | Maximum [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)	143,983
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$ 27,800