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Income Per Share and Per Unit - Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Numerator        
Net income available to common stockholders for basic computation $ 276,926 $ 1,761,106 $ 2,147,942 $ 2,244,205
Denominator        
Weighted average number of common shares outstanding for basic computation 13,813,168 14,949,651 13,898,910 14,871,281
Basic net income per share $ 0.02 $ 0.12 $ 0.15 $ 0.15
Weighted average number of common shares outstanding for diluted computation 13,815,035 14,949,651 13,908,359 14,871,281
Diluted net income per share $ 0.02 $ 0.12 $ 0.15 $ 0.15