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Note 4 - Fair Value Measurements (Details Textual) $ in Thousands			3 Months Ended		6 Months Ended
	Feb. 03, 2020 USD ($)	Jan. 24, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Certificates of Deposit, at Carrying Value			$ 7,500		$ 7,500
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability			4,196	$ 0	(20,326)	$ 0
COVID 19 [Member]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability			$ 4,200		(20,300)
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 [Member]
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High		$ 60,000
Parcus Medical [Member] | Measurement Input, Discount Rate [Member] | Regulatory Earn Out Milestone [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input			0.033		0.033
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			0.160		0.160
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			0.038		0.038
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			0.140		0.140
US Treasury Bill Securities [Member]
Debt Securities, Available-for-sale, Total			$ 20,100		$ 20,100		$ 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

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

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

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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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