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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

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