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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This element represents the amount of any change recognized during the period in the high-end of the estimated range of outcomes (undiscounted) of a liability assumed in a business combination arising from an item of contingent consideration.

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

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A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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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		9 Months Ended
	Oct. 15, 2020 USD ($)	Feb. 03, 2020 USD ($)	Jan. 24, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Certificates of Deposit, at Carrying Value				$ 5,500		$ 5,500
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability				4,150	$ 0	(16,176)	$ 0
Subsequent Event [Member]
Payment for Contingent Consideration Liability, Financing Activities	$ 5,000
COVID 19 [Member]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability				$ 4,200		(16,200)
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
Arthrosurface [Member] \| Probability of Achievement [Member] \| Regulatory Earn Out Milestone [Member] \| Maximum [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input				0.90		0.90
Arthrosurface [Member] \| Measurement Input, Weighted Average Cost of Capital [Member] \| Minimum [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input				0.115		0.115
Arthrosurface [Member] \| Measurement Input, Weighted Average Cost of Capital [Member] \| Maximum [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input				0.130		0.130
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] \| Minimum [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input				0.145		0.145
Parcus Medical [Member] \| Measurement Input, Weighted Average Cost of Capital [Member] \| Maximum [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input				0.150		0.150
US Treasury Bill Securities [Member]
Debt Securities, Available-for-sale, Total				$ 15,000		$ 15,000		$ 27,500