Note 17 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Feb. 03, 2020
Deferred Tax Liabilities, Net, Total	$ 11,895
Unrecognized Tax Benefits, Ending Balance	0	$ 0
Income Tax Expense (Benefit), Total	(4,642)	$ 8,928	$ 4,485
Accounting Standards Update 2016-09 [Member]
Income Tax Expense (Benefit), Total	200		$ 1,500
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards, Total	8,600
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Research Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount	1,900
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total	3,000
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount	70
Foreign Tax Authority [Member] | Ministry of Economic Affairs and Finance, Italy [Member]
Operating Loss Carryforwards, Total	8,500
Operating Loss Carryforwards, Valuation Allowance, Total	900
Arthrosurface [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities	$ 11,200			$ 11,147