Computation of Basic and Diluted Earnings per Common Share (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Components Of Basic And Diluted Earning Per Share [Line Items]
Income (loss) (numerator)	$ (442,671)	$ 2,902,136	$ 10,688,268
Shares (denominator)	8,974,990	8,923,269	13,629,671
Per share amount	$ (0.05)	$ 0.33	$ 0.78
Stock options		141,902	109,845
Income (loss) (numerator)	$ (442,671)	$ 2,902,136	$ 10,688,268
Shares (denominator)	8,974,990	9,065,171	13,739,516
Share (denominator)	8,974,900
Per share amount	$ (0.05)	$ 0.32	$ 0.78