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Note 4 - Fair Value Measurements - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Contingent consideration- short term | $ 11,688 | $ 0
Contingent consideration- long term | 37,062 | 0
Estimate of Fair Value Measurement [Member] |  |
Investments | 27,624 |
Contingent consideration- short term | 11,688 |
Contingent consideration- long term | 37,062 |
Total other current and long-term liabilities | 48,750 |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Investments | 20,110 |
Contingent consideration- short term | 0 |
Contingent consideration- long term | 0 |
Total other current and long-term liabilities | 0 |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Investments | 7,514 |
Contingent consideration- short term | 0 |
Contingent consideration- long term | 0 |
Total other current and long-term liabilities | 0 |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Investments | 0 |
Contingent consideration- short term | 11,688 |
Contingent consideration- long term | 37,062 |
Total other current and long-term liabilities | 48,750 |
Reported Value Measurement [Member] |  |
Investments | 27,702 |
Contingent consideration- short term | 0 |
Contingent consideration- long term | 0 |
Total other current and long-term liabilities | 0 |
Money Market Funds [Member] | Estimate of Fair Value Measurement [Member] |  |
Cash equivalents | 49,357 | 48,971
Money Market Funds [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cash equivalents | 49,357 | 48,971
Money Market Funds [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Cash equivalents | 0 | 0
Money Market Funds [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Cash equivalents | 0 | 0
Money Market Funds [Member] | Reported Value Measurement [Member] |  |
Cash equivalents | 49,357 | 48,971
Certificates of Deposit [Member] | Estimate of Fair Value Measurement [Member] |  |
Cash equivalents | 7,514 |
Certificates of Deposit [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cash equivalents | 0 |
Certificates of Deposit [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Cash equivalents | 7,514 |
Certificates of Deposit [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Cash equivalents | 0 |
Certificates of Deposit [Member] | Reported Value Measurement [Member] |  |
Cash equivalents | 7,524 |
US Treasury Securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Investments | 20,110 | 27,480
US Treasury Securities [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Investments | 20,110 | 27,480
US Treasury Securities [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Investments | 0 | 0
US Treasury Securities [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Investments | 0 | 0
US Treasury Securities [Member] | Reported Value Measurement [Member] |  |
Investments | $ 20,178 | $ 27,479

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