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Note 4 - Fair Value Measurements (Details Textual) $ in Thousands			3 Months Ended
	Feb. 03, 2020 USD ($)	Jan. 24, 2020 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Certificates of Deposit, at Carrying Value			$ 1,300
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability			(24,522)
COVID-19 Pandemic [Member]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability			(24,500)
Parcus Medical and Arthrosurface Acquisitions [Member]
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High			$ 100,000
Arthrosurface [Member]
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High	$ 40,000
Arthrosurface [Member] | Measurement Input, Discount Rate [Member] | Regulatory Earn Out Milestone [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input			0.061
Arthrosurface [Member] | Probability of Achievement [Member] | Regulatory Earn Out Milestone [Member] | Minimum [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input			0.6
Arthrosurface [Member] | Probability of Achievement [Member] | Regulatory Earn Out Milestone [Member] | Maximum [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input			0.9
Arthrosurface [Member] | Measurement Input, Weighted Average Cost of Capital [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input			0.135		0.115
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			0.16		0.145
US Treasury Bill Securities [Member]
Debt Securities, Available-for-sale, Total			$ 25,200		$ 27,500

X

- Definition

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

+ References

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Value of input used to measure contingent consideration liability from business combination.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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