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Note 5 - Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 55 Months Ended
Mar. 02, 2016
Mar. 31, 2016
Mar. 31, 2016
Mar. 31, 2016
Feb. 29, 2016
Jul. 20, 2012
Aug. 31, 2011
Common Class A [Member] | The 2011 Stock Repurchase Authorization [Member] | Additional Shares Authorized [Member]              
Stock Repurchase Program, Number of Shares Authorized to be Repurchased           1,000,000  
Common Class A [Member] | The 2011 Stock Repurchase Authorization [Member]              
Stock Repurchase Program, Number of Shares Authorized to be Repurchased             2,000,000
Stock Repurchased During Period, Shares     599,123 2,327,636      
Treasury Stock Acquired, Average Cost Per Share     $ 79.21 $ 51.09      
Stock Repurchased During Period, Value     $ 47.5        
Common Class A [Member] | The 2016 Stock Repurchase Authorization [Member]              
Stock Repurchased During Period, Shares   19,000          
Treasury Stock Acquired, Average Cost Per Share   $ 92.20          
Stock Repurchased During Period, Value   $ 1.8          
Stock Repurchase Program, Authorized Amount         $ 250.0    
Stock Repurchase Program, Remaining Authorized Repurchase Amount   $ 248.2 $ 248.2 $ 248.2      
Common Class A [Member] | Restricted Stock Units (RSUs) [Member]              
Treasury Stock Acquired, Average Cost Per Share     $ 90.48        
Shares Paid for Tax Withholding for Share Based Compensation     94,363        
Adjustments Related to Tax Withholding for Share-based Compensation     $ 8.5        
Conversion from Class B Common Stock to Class A Common Stock [Member] | Board of Directors Chairman [Member]              
Conversion of Stock, Shares Converted 780,000