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Note 5 - Fair Value Measurements - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Investments: |  |
Investments | $ 69,972 | $ 24,000
Estimate of Fair Value Measurement [Member] |  |
Cash equivalents: |  |
Cash equivalents |  | 6,393
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cash equivalents: |  |
Cash equivalents |  | 5,893
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Cash equivalents: |  |
Cash equivalents |  | 500
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Cash equivalents: |  |
Cash equivalents |  |
Reported Value Measurement [Member] |  |
Cash equivalents: |  |
Cash equivalents |  | 6,393
Money Market Funds [Member] | Estimate of Fair Value Measurement [Member] |  |
Cash equivalents: |  |
Cash equivalents | 4,984 | 5,893
Money Market Funds [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cash equivalents: |  |
Cash equivalents | 4,984 | 5,893
Money Market Funds [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Cash equivalents: |  |
Cash equivalents |  |
Money Market Funds [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Cash equivalents: |  |
Cash equivalents |  |
Money Market Funds [Member] | Reported Value Measurement [Member] |  |
Cash equivalents: |  |
Cash equivalents | 4,984 | 5,893
Certificates of Deposit [Member] | Estimate of Fair Value Measurement [Member] |  |
Cash equivalents: |  |
Cash equivalents |  | 500
Investments: |  |
Investments |  | 24,000
Certificates of Deposit [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cash equivalents: |  |
Cash equivalents |  |
Investments: |  |
Investments |  |
Certificates of Deposit [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Cash equivalents: |  |
Cash equivalents |  | 500
Investments: |  |
Investments |  | 24,000
Certificates of Deposit [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Cash equivalents: |  |
Cash equivalents |  |
Investments: |  |
Investments |  |
Certificates of Deposit [Member] | Reported Value Measurement [Member] |  |
Cash equivalents: |  |
Cash equivalents |  | 500
Investments: |  |
Investments |  | $ 24,000
US Treasury Securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Investments: |  |
Investments | 69,972 |
US Treasury Securities [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Investments: |  |
Investments | 69,972 |
US Treasury Securities [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Investments: |  |
Investments |  |
US Treasury Securities [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Investments: |  |
Investments |  |
US Treasury Securities [Member] | Reported Value Measurement [Member] |  |
Investments: |  |
Investments | $ 69,972 |

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