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Note 4 - Fair Value Measurements - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Business Combination, Contingent Consideration, Liability, Current | $ 4,315 | $ 13,090
Contingent Consideration - Long Term | 0 | 22,320
Estimate of Fair Value Measurement [Member] |  |
Business Combination, Contingent Consideration, Liability, Current | 4,315 | 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] |  |
Business Combination, Contingent Consideration, Liability, Current | 0 | 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] |  |
Business Combination, Contingent Consideration, Liability, Current | 0 | 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] |  |
Business Combination, Contingent Consideration, Liability, Current | 4,315 | 13,090
Contingent Consideration - Long Term |  | 22,320
Total other current and long-term liabilities |  | 35,410
Reported Value Measurement [Member] |  |
Business Combination, Contingent Consideration, Liability, Current | 0 | 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 | 67,046 | 74,522
Money Market Funds [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cash equivalents | 67,046 | 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 | $ 67,046 | 74,522
US Treasury Securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Investments |  | 2,501
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
US Treasury Securities [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Investments |  | 0
US Treasury Securities [Member] | Reported Value Measurement [Member] |  |
Investments |  | $ 2,524

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