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Stockholders' Equity - Additional Information (Detail) - USD ($)
 12 Months Ended
Jan. 08, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 08, 2015
Class of Stock [Line Items]        
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 share repurchases   $ 2,500,000    
Payments for treasury stock   $ 254,405 $ 377,480  
Payments for treasury stock, shares   51,275    
Aggregate amount permitted for cash dividends and share repurchases in 2015   $ 5,000,000    
Aggregate amount permitted for cash dividends and share repurchases in 2016 and thereafter   6,000,000    
Cash dividends paid   $ 4,121,804 $ 4,104,155  
Dividend declared per share       $ 0.045
Subsequent Event [Member]        
Class of Stock [Line Items]        
Cash dividends paid $ 1,000,000