Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

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Value of input used to measure contingent consideration liability from business combination.

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Amount of cash outflow, not made soon after acquisition date of business combination, to settle contingent consideration liability up to amount recognized at acquisition date, including, but not limited to, measurement period adjustment and less amount paid soon after acquisition date.

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Note 4 - Fair Value Measurements (Details Textual) $ in Thousands			1 Months Ended		3 Months Ended		9 Months Ended
	Jul. 01, 2021 USD ($)	Feb. 03, 2020 USD ($)	Jul. 31, 2021 USD ($)	Oct. 31, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Debt Securities, Available-for-sale, Total					$ 0		$ 0
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability					$ (3,450)	$ 4,150	(21,920)	$ (16,176)
Payment for Contingent Consideration Liability, Financing Activities							7,220	$ (0)
Parcus Medical and Arthrosurface Acquisitions [Member]
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High							$ 100,000
Parcus Medical and Arthrosurface Acquisitions [Member] \| Measurement Input, Discount Rate [Member] \| Minimum [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input					3.2		3.2
Parcus Medical and Arthrosurface Acquisitions [Member] \| Measurement Input, Discount Rate [Member] \| Maximum [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input					3.3		3.3
Parcus Medical and Arthrosurface Acquisitions [Member] \| Measurement Input, Weighted Average Cost of Capital [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input					11.6		11.6		11.4
Parcus Medical and Arthrosurface Acquisitions [Member] \| Measurement Input, Weighted Average Cost of Capital [Member] \| Minimum [Member] \| Regulatory Earn Out Milestone [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input									60
Parcus Medical and Arthrosurface Acquisitions [Member] \| Measurement Input, Weighted Average Cost of Capital [Member] \| Maximum [Member] \| Regulatory Earn Out Milestone [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input									75
Arthrosurface [Member]
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High		$ 40,000
Payment for Contingent Consideration Liability, Financing Activities	$ 10,000		$ 10,000	$ 5,000
Arthrosurface [Member] \| Probability of Achievement [Member] \| Remaining Regulatory Earn Out Milestones [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input					0		0
US Treasury Bill Securities [Member]
Debt Securities, Available-for-sale, Total									$ 2,500