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Note 6 - Stockholders' Equity (Details) (USD $)
 3 Months Ended 6 Months Ended 23 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Common Class A [Member]
Related to Tax Withholdings [Member]
Jun. 30, 2013
Common Class A [Member]
Jun. 30, 2013
Common Class A [Member]
Jul. 31, 2012
Common Class A [Member]
Aug. 31, 2011
Common Class A [Member]
Note 6 - Stockholders' Equity (Details) [Line Items]                
Stock Repurchase Program, Number of Shares Authorized to be Repurchased             1,000,000 2,000,000
Stock Repurchased During Period, Shares         127,900 1,273,047    
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share)       $ 45.04 $ 40.76      
Stock Repurchased During Period, Value (in Dollars)         $ 5,200,000      
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased 1,726,953 1,726,953            
Shares Paid for Tax Withholding for Share Based Compensation         59,721      
Adjustments Related to Tax Withholding for Share-based Compensation (in Dollars)         2,700,000      
Common Stock, Dividends, Per Share, Cash Paid (in Dollars per share) $ 0.13              
Payments of Dividends (in Dollars) $ 3,400,000 $ 3,356,000 $ 4,398,000