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Note 4 - Fair Value Measurements (Details Textual) $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 01, 2021 USD ($) | Feb. 03, 2020 USD ($) | Jan. 24, 2020 USD ($) | Jul. 31, 2021 USD ($) | Oct. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Debt Securities, Available-for-sale, Total |  |  |  |  |  | $ 0 |  |
Payment for Contingent Consideration Liability, Financing Activities |  |  |  |  |  | 7,220 | $ 4,478 | $ (0)
Business Combination, Contingent Consideration, Liability, Current |  |  |  |  |  | 4,315 | 13,090 |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability |  |  |  |  |  | (21,095) | $ (28,666) | $ 0
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] | Minimum [Member] | Measurement Input, Discount Rate [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input |  |  |  |  |  | 3.1 |  |
Parcus Medical and Arthrosurface Acquisitions [Member] | Minimum [Member] | Measurement Input, Weighted Average Cost of Capital [Member] | Regulatory Earn Out Milestone [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input |  |  |  |  |  |  | 60 |
Parcus Medical and Arthrosurface Acquisitions [Member] | Maximum [Member] | Measurement Input, Discount Rate [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input |  |  |  |  |  | 3.4 |  |
Parcus Medical and Arthrosurface Acquisitions [Member] | Maximum [Member] | Measurement Input, Weighted Average Cost of Capital [Member] | Regulatory Earn Out Milestone [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input |  |  |  |  |  |  | 75 |
Parcus Medical [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High |  |  | $ 60,000 |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Current |  |  |  |  |  | $ 4,300 |  |
Parcus Medical [Member] | Measurement Input, Weighted Average Cost of Capital [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input |  |  |  |  |  | 11.3 | 11.4 |
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 | $ 10,000 |  |  | $ 10,000 | $ 5,000 |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability |  |  |  |  |  | $ 21,100 | $ 28,700 |
Arthrosurface [Member] | Measurement Input, Weighted Average Cost of Capital [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input |  |  |  |  |  |  | 11.4 |
US Treasury Bill Securities [Member] |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale, Total |  |  |  |  |  |  | $ 2,500 |

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