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Note 4 - Fair Value Measurements (Details Textual) $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Oct. 15, 2020 USD ($) | Feb. 03, 2020 USD ($) | Jan. 24, 2020 USD ($) | Oct. 31, 2020 USD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($)
Debt Securities, Available-for-sale, Total |  |  |  |  | $ 0 |  |
Payment for Contingent Consideration Liability, Financing Activities | $ 5,000 |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability |  |  |  |  | (4,820) | $ (24,522) |
COVID 19 [Member] |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability |  |  |  |  | 4,800 |  |
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 |  |  |  |  | 0.036 |  |
Parcus Medical and Arthrosurface Acquisitions [Member] | Measurement Input, Discount Rate [Member] | Minimum [Member] |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input |  |  |  |  | 0.026 |  |
Parcus Medical and Arthrosurface Acquisitions [Member] | Measurement Input, Discount Rate [Member] | Maximum [Member] |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input |  |  |  |  | 0.028 |  |
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] | Probability of Achievement [Member] | Minimum [Member] | Regulatory Earn Out Milestone [Member] |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input |  | 0.60 |  |  | 0 |  |
Arthrosurface [Member] | Probability of Achievement [Member] | Maximum [Member] | Regulatory Earn Out Milestone [Member] |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input |  | 0.75 |  |  | 0.70 |  |
Arthrosurface [Member] | Measurement Input, Weighted Average Cost of Capital [Member] |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input |  | 0.115 |  |  | 0.121 |  |
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 |  | 0.121 |  |
US Treasury Bill Securities [Member] |  |  |  |  |  |  |
Debt Securities, Available-for-sale, Total |  |  |  |  |  |  | $ 2,500

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