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Stockholders' Equity (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Stockholders' Equity (Textual) [Abstract]    
Payments for treasury stock $ (111,854) $ (214,137)
Stockholders' Equity (Additional Textual) [Abstract]    
Condition of electing directors by class a and class b common stock vote In the election of directors, the holders of Class A common stock are entitled by class vote, exclusive of other stockholders, to elect two of the Company’s directors, with each Class A share being entitled to one vote. In the election of the other six directors and all other matters submitted to the stockholders for a vote, the holders of Class A shares and Class B shares shall vote as a single class, with each Class A share being entitled to one vote and each Class B share entitled to ten votes  
Aggregate amount permitted for cash dividends and share repurchases 2,000,000  
Aggregate amount permitted for cash dividends and share repurchases in 2013 4,000,000  
Aggregate amount permitted for cash dividends and share repurchases in 2014 and 2015 5,000,000  
Aggregate amount permitted for cash dividends and share repurchases in 2016 and thereafter 6,000,000  
Cash dividends paid (1,927,564)   
Class A common stock [Member]
    
Stockholders' Equity (Textual) [Abstract]    
Payments for treasury stock $ (111,854) $ (214,137)
Purchase of treasury stock, shares 32,587 33,983