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Note 11 - Fair Value Measurements - Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Investment available for sale $ 15,800 $ 16,700
Fair Value, Recurring [Member]    
Cash and cash equivalents 344,557 519,182
Restricted cash 12,571 15,817
Investment available for sale 15,822 16,692
Contingent payments 62 924
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents 344,557 519,182
Restricted cash 12,571 15,817
Investment available for sale 0 0
Contingent payments 0 0
Fair Value, Recurring [Member] | 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 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Cash and cash equivalents 0 0
Restricted cash 0 0
Investment available for sale 15,822 16,692
Contingent payments $ 62 $ 924