Stock-Based Compensation - Additional Information (Detail) (USD $)	1 Months Ended	6 Months Ended
	Feb. 21, 2013	Jun. 30, 2013	Jun. 30, 2012
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Stock-based compensation expense	$ 36,750	$ 122,429	$ 2,925
Stock price volatility, risk free interest period		5 years
Unrecognized compensation expenses related to stock options		$ 1.08
Additional options granted under plan		89,500
Historical dividend yield		3.60%
Expected stock price volatility		33.80%
Risk-free interest rate		0.86%
Officers [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Additional options granted under plan	7,000
2003 Incentive Stock Option Plan [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Shares available for grant		385,000
Fair value of options granted		$ 0
2008 Non-Employee Directors Stock Option Plan [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Fair value of options granted		$ 89,500