Note 15 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Feb. 03, 2020
Income Tax Expense (Benefit), Total	$ (1,744)	$ 3,331	$ (2,161)	$ 7,817
Effective Income Tax Rate Reconciliation, Percent, Total	21.40%	26.60%	20.60%	25.30%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount	$ 1,900		$ 1,900
Effective Income Tax Rate Reconciliation,Change in Fair Value of Business Acquisition Contingent Consideration Liabilities, Amount	1,500		1,500
Deferred Tax Assets, Valuation Allowance, Total	500		500
Arthrosurface [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities	$ 11,200		$ 11,200		$ 11,147