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Common Stock (Details) (USD $)
 0 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended
Oct. 31, 2012
Aug. 31, 2012
Jul. 31, 2012
Sep. 30, 2012
Sep. 30, 2011
Aug. 31, 2012
Class A [Member]
Jul. 31, 2012
Class A [Member]
Aug. 31, 2012
Class B [Member]
Jul. 31, 2012
Class B [Member]
Sep. 30, 2012
Class B [Member]
Nov. 30, 2006
Class B [Member]
Aug. 31, 2012
Common Class A and Class B [Member]
Common stock (Textual) [Abstract]                        
Dividend payable per share $ 0.035         $ 0.035 $ 0.02 $ 0.035 $ 0.02      
Shares repurchased, value                   $ 1,600,000    
Company incremental dividends           $ 0.015   $ 0.015        
Incremental dividends paid                       565,000
Number of additional shares authorized to be repurchased                     13,000,000  
Shares repurchased, average stock price per share                   $ 4.29    
Number of shares repurchased                   365,000    
Common Stock (Additional Textual) [Abstract]                        
Common stock dividend payments     753,000 2,806,000 2,193,000              
Increase in dividend payable rate   $ 0.14                    
Increase in dividend payable amount   5,300,000                    
Treasury stock shares retired       1,000,000                
Excess of purchase price over par value       $ 2,600,000