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Note 8 - Stockholders' Equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 12 Months Ended 12 Months Ended 29 Months Ended 12 Months Ended
Dec. 31, 2012
Nov. 30, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Additional Shares Authorized [Member]
Common Class A [Member]
Dec. 31, 2013
Common Class A [Member]
Dec. 31, 2012
Common Class A [Member]
Dec. 31, 2011
Common Class A [Member]
Dec. 31, 2013
Common Class A [Member]
Aug. 31, 2011
Common Class A [Member]
Jun. 30, 2000
Common Class A [Member]
Dec. 31, 2013
Common Class B [Member]
Note 8 - Stockholders' Equity (Details) [Line Items]                          
Common Stock, Voting Rights             one           ten
Stock Repurchase Program, Number of Shares Authorized to be Repurchased           1,000,000         2,000,000 1,000,000  
Stock Repurchased During Period, Shares         419,376         1,273,047      
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share)                   $ 24.18      
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 80,687 56,012        
Payments of Dividends (in Dollars) $ 2,600 $ 2,500 $ 10,085 $ 12,066 $ 6,822