XML 23 R42.htm IDEA: XBRL DOCUMENT v3.3.0.814
Note 5 - Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended 50 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Jul. 20, 2012
Aug. 31, 2011
Common Class A [Member] | Additional Shares Authorized [Member]        
Stock Repurchase Program, Number of Shares Authorized to be Repurchased     1,000,000  
Common Class A [Member] | Restricted Stock Units (RSUs) [Member]        
Treasury Stock Acquired, Average Cost Per Share $ 88.48      
Shares Paid for Tax Withholding for Share Based Compensation 77,596      
Adjustments Related to Tax Withholding for Share-based Compensation $ 6.9      
Common Class A [Member]        
Stock Repurchase Program, Number of Shares Authorized to be Repurchased       2,000,000
Treasury Stock Acquired, Average Cost Per Share $ 105.15 $ 38.51    
Stock Repurchased During Period, Shares 164,837 1,664,613    
Stock Repurchased During Period, Value $ 17.3      
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased 1,335,387 1,335,387