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Note 4 - Fair Value Measurements (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Feb. 01, 2020
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Payments to Acquire Investments, Total   $ (0) $ 63,800  
Investment in Limited Partnership Member]        
Provision for Credit Loss on Investments   0    
Equity Method Investments   49,900   $ 49,500
Cost Based Investments [Member]        
Investments, Total   14,000   14,000
Vexcel Group, Inc. [Member]        
Payments to Acquire Investments, Total $ 63,800      
Equity Securities Without Readily Determinable Fair Value, Percentage 35.00%      
Equity Securities without Readily Determinable Fair Value, Amount   129,100   129,100
Provision for Credit Loss on Investments   0    
Registered Investment Companies [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]        
Investments, Fair Value Disclosure, Total   $ 4,300   $ 4,100