Note 4 - Fair Value Measurements - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Contingent Consideration - Short Term	$ 11,855	$ 0
Contingent Consideration - Long Term	41,045	0
Estimate of Fair Value Measurement [Member]
Investments	20,542
Contingent Consideration - Short Term	11,855
Contingent Consideration - Long Term	41,045
Total Other current and long-term liabilities	52,900
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Investments	15,039
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	5,503
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	11,855
Contingent Consideration - Long Term	41,045
Total Other current and long-term liabilities	52,900
Reported Value Measurement [Member]
Investments	20,646
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	56,431	48,971
Money Market Funds [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Cash equivalents	56,431	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	56,431	48,971
Certificates of Deposit [Member] \| Estimate of Fair Value Measurement [Member]
Cash equivalents	5,503
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	5,503
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	5,516
US Treasury Securities [Member] \| Estimate of Fair Value Measurement [Member]
Investments	15,039	27,480
US Treasury Securities [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Investments	15,039	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	$ 15,130	$ 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.

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