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Note 9 - Fair Value Measurements - Fair Value of Financial Instruments (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Cash and cash equivalents $ 269,155 $ 283,472
Restricted cash 2,479 11,593
Investment available for sale 13,098 13,670
Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents 269,155 283,472
Restricted cash 2,479 11,593
Investment available for sale 0 0
Fair Value, Inputs, Level 2 [Member]    
Cash and cash equivalents 0 0
Restricted cash 0 0
Investment available for sale 0 0
Fair Value, Inputs, Level 3 [Member]    
Cash and cash equivalents 0 0
Restricted cash 0 0
Investment available for sale $ 13,098 $ 13,670