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

Represents the fair value disclosure for cash equivalents as of the balance sheet date.

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Amount of liability recognized arising from contingent consideration in a business combination.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

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