Earnings Per Common Share - Details of Computation of Earnings per Common Share, Basic and Diluted (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator:
Net income for basic calculation	$ 457,730	$ 465,665	$ 1,390,115	$ 3,010,626
Adjustments to net income for the impact of dilutive securities	0	0	0	0
Net income for dilution calculation	$ 457,730	$ 465,665	$ 1,390,115	$ 3,010,626
Denominator:
Weighted average common shares - basic	11,499,832	11,320,904	11,487,280	11,308,833
Effect of dilutive securities:
RSUs	146,152	150,070	117,609	130,191
Stock options	128,700	293,236	153,479	306,475
Weighted average common shares - diluted	11,774,684	11,764,210	11,758,368	11,745,499
Basic	$ 0.04	$ 0.04	$ 0.12	$ 0.27
Diluted	$ 0.04	$ 0.04	$ 0.12	$ 0.26