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Equity Compensation Plans - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2015
Mar. 31, 2014
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Intrinsic value of options granted     $ 138,030
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock grants 7,500 7,500  
Restricted stock vesting period 1 year 1 year  
Restricted stock grant date fair value $ 141,450 $ 138,000  
Restricted stock cost 11,788 11,500  
Restricted stock, deferred taxes $ 4,397 $ 4,290  
Directors Stock Option Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Intrinsic value of options granted     138,030
Employee Stock Option Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Intrinsic value of options granted     0
2013 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Intrinsic value of options granted     $ 0
Granted, shares     0