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Note 4 - Fair Value Measurements - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Contingent Consideration - Short Term | $ 13,090 | $ 0
Contingent Consideration - Long Term | 22,320 | 0
Estimate of Fair Value Measurement [Member] |  |
Contingent Consideration - Short Term | 13,090 |
Contingent Consideration - Long Term | 22,320 |
Total other current and long-term liabilities | 35,410 |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cash equivalents |  | 48,971
Investments |  | 27,480
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] |  |
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] |  |
Contingent Consideration - Short Term | 13,090 |
Contingent Consideration - Long Term | 22,320 |
Total other current and long-term liabilities | 35,410 |
Reported Value Measurement [Member] |  |
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 | 74,522 | 48,971
Money Market Funds [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cash equivalents | 74,522 |
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 | 74,522 | 48,971
US Treasury Securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Investments | 2,501 | 27,480
US Treasury Securities [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Investments | 2,501 |
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 | $ 2,524 | $ 27,479

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