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Note 4 - Investments and Fair Value Measurements (Details Textual) - USD ($)
$ in Thousands
9 Months Ended
Mar. 23, 2022
Sep. 30, 2022
Dec. 31, 2021
Equity Securities without Readily Determinable Fair Value, Amount   $ 199,400 $ 161,600
Equity Method Investments   28,300 54,600
Provision for Credit Loss on Investments   0  
Vexcel Group, Inc. [Member]      
Payments to Acquire Equity Securities, FV-NI $ 37,000    
Ownership Percentage, Acquired 4.60%    
Equity Securities Without Readily Determinable Market Values, Ownership Percentage 43.30%    
Equity Securities without Readily Determinable Fair Value, Amount   181,100 144,100
Registered Investment Companies [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]      
Investments, Fair Value Disclosure, Total   $ 3,800 $ 5,000