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Note 8 - Fair Value Measurements - Fair Value of Financial Instruments (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Cash and cash equivalents $ 402,975 $ 344,557
Restricted cash 16,249 12,571
Investment available for sale 15,612 15,822
Contingent payments   62
Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents 402,975 344,557
Restricted cash 16,249 12,571
Investment available for sale 0 0
Contingent payments   0
Fair Value, Inputs, Level 2 [Member]    
Cash and cash equivalents 0 0
Restricted cash 0 0
Investment available for sale 0 0
Contingent payments   0
Fair Value, Inputs, Level 3 [Member]    
Cash and cash equivalents 0 0
Restricted cash 0 0
Investment available for sale $ 15,612 15,822
Contingent payments   $ 62