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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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Note 4 - Fair Value Measurements (Details Textual) $ in Thousands		1 Months Ended		3 Months Ended		6 Months Ended
	Feb. 03, 2020 USD ($)	Jul. 31, 2021 USD ($)	Oct. 31, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 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				(13,650)	$ 4,196	(18,470)	$ (20,326)
Business Combination, Contingent Consideration, Liability, Total				$ 16,900		16,900
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] \| Regulatory Earn Out Milestone [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input				0.027		0.027
Parcus Medical and Arthrosurface Acquisitions [Member] \| Measurement Input, Discount Rate [Member] \| Minimum [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input				0.022		0.022
Parcus Medical and Arthrosurface Acquisitions [Member] \| Measurement Input, Discount Rate [Member] \| Maximum [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input				0.023		0.023
Parcus Medical and Arthrosurface Acquisitions [Member] \| Measurement Input, Weighted Average Cost of Capital [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input				11.8		11.8		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			$ 5,000
Arthrosurface [Member] \| Subsequent Event [Member]
Payment for Contingent Consideration Liability, Financing Activities		$ 10,000
Arthrosurface [Member] \| Probability of Achievement [Member] \| One Regulatory Earn Out Milestone [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input				100		100
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