Note 4 - Business Combinations (Details Textual) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended		11 Months Ended
	Jan. 22, 2021	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2021
Payments to Acquire Businesses, Net of Cash Acquired, Total				$ 127,413	$ (0)
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability				(8,513)	$ 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, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability		$ 800		$ 8,500
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles			$ (3,900)
Goodwill, Purchase Accounting Adjustments			6,400
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Contingent Consideration			3,300
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Tax Liabilities			(500)
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Cash Paid			$ (300)
Acquired 3D Hubs [Member] | Forecast [Member] | Maximum [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)						143,983
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable						$ 27,800
Payments to Acquire Businesses, Gross						$ 25,000