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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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				3 Months Ended				12 Months Ended
	Oct. 15, 2020 USD ($)	Feb. 03, 2020 USD ($)	Jan. 24, 2020 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Payment for Contingent Consideration Liability, Financing Activities	$ 5,000							$ 4,478	$ (0)	$ (0)
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability				$ (12,500)	$ 4,100	$ 4,200	$ (24,500)	(28,666)	0	$ 0
COVID 19 [Member]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability								(28,700)
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] \| Minimum [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input				0.020				0.020
Parcus Medical and Arthrosurface Acquisitions [Member] \| Measurement Input, Discount Rate [Member] \| Regulatory Earn Out Milestone [Member] \| Maximum [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input				0.025				0.025
Arthrosurface [Member]
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High		$ 40,000
Arthrosurface [Member] \| Probability of Achievement [Member] \| Regulatory Earn Out Milestone [Member] \| Minimum [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input		0.60		0.60				0.60
Arthrosurface [Member] \| Probability of Achievement [Member] \| Regulatory Earn Out Milestone [Member] \| Maximum [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input		0.90		0.75				0.75
Arthrosurface [Member] \| Measurement Input, Weighted Average Cost of Capital [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input		0.115		0.114				0.114
Parcus Medical [Member]
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High			$ 60,000
Parcus Medical [Member] \| Measurement Input, Weighted Average Cost of Capital [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input			0.145	0.114				0.114
US Treasury Bill Securities [Member]
Debt Securities, Available-for-sale, Total				$ 2,500				$ 2,500	$ 27,500