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Note 3 - Fair Value Measurements - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Investments: |  |
Investments | $ 27,480 | $ 69,972
Money Market Funds [Member] | Estimate of Fair Value Measurement [Member] |  |
Cash equivalents: |  |
Cash equivalents | 48,971 | 4,984
Money Market Funds [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cash equivalents: |  |
Cash equivalents | 48,971 | 4,984
Money Market Funds [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Cash equivalents: |  |
Cash equivalents | 48,971 | 4,984
US Treasury Securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Investments: |  |
Investments | 27,480 | 69,972
US Treasury Securities [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Investments: |  |
Investments | 27,480 | 69,972
US Treasury Securities [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Investments: |  |
Investments | $ 27,479 | $ 69,972

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