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Earnings Per Share - Schedule of Net Income Per Share (Detail) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share [Abstract]    
Net income $ 6,362,322 $ 39,999,367
Weighted-average shares outstanding:    
Basic 22,911,727 22,811,825
Effect of dilutive restricted stock 113,993 132,990
Diluted 23,025,720 22,944,815
Net income per basic share $ 0.28 $ 1.75
Net income per diluted share $ 0.28 $ 1.74