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Stock Options - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock market value per share $ 0.2 $ 0.2 $ 0.2 $ 0.2  
Restricted stock non-vested shares 7,500   7,500    
Unrecognized stock-based compensation expense $ 47,150   $ 47,150    
Intrinsic value of options granted     $ 238,975    
Total intrinsic value of options exercised     $ 1,950 $ 0  
Stock options granted     0 0  
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock restriction period     1 year 1 year  
Restricted stock grants     7,500 7,500  
Common stock market value per share $ 18.86 $ 18.40 $ 18.86 $ 18.40  
Restricted stock grant date fair value $ 141,450 $ 138,000 $ 141,450 $ 138,000  
Restricted stock cost 11,788 11,500 117,300 115,000  
Restricted stock, deferred taxes $ 4,397 $ 4,290 $ 44,250 $ 42,900  
Employee Stock Option Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options granted, expiration period     10 years    
Intrinsic value of options granted     $ 5,980    
Directors Stock Option Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock restriction period     6 months    
Stock options granted, expiration period     10 years    
Intrinsic value of options granted     $ 232,995    
Stock options granted     0 0 0
Directors Stock Option Plan | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options granted     210,000    
2013 Incentive Compensation Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options granted     0