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Note 4 - Investments and Fair Value Measurements (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Equity Securities without Readily Determinable Fair Value, Amount $ 200,900 $ 200,900 $ 201,500
Equity Method Investments 29,100 29,100 28,300
Provision for Credit Loss on Investments 0 0  
Registered Investment Companies [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]      
Investments, Fair Value Disclosure $ 2,500 $ 2,500 $ 4,000