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Note 8 - Fair Value Measurements - Fair Value of Financial Instruments (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Cash and cash equivalents $ 280,783 $ 304,271
Restricted cash 3,946 3,659
Investment available for sale 12,495 13,327
Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents 280,783 304,271
Restricted cash 3,946 3,659
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 $ 12,495 $ 13,327