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Note 4 - Fair Value Measurements (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 01, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Payments to Acquire Investments, Total   $ (0) $ (0) $ 63,800 $ (0)  
Investment in Limited Partnership Member]            
Provision for Credit Loss on Investments   0   0    
Equity Method Investments   16,200   16,200   $ 13,100
Cost Based Investments [Member]            
Investments, Total   14,000   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   129,700   129,700    
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, Total   $ 3,500   $ 3,500   $ 3,600