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Net Income (Loss) Per Share - Summary of Computation of Net Income (Loss) Per Share (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Numerator:
Net income (loss)	$ (1,105,791)	$ 385,090
Denominator:
Basic	9,479,742	9,359,562
Plus dilutive effect of potential common shares		842,044
Weighted average common shares outstanding - diluted	9,479,742	10,201,606
Net income (loss) per share:
Basic	$ (0.12)	$ 0.04
Diluted	$ (0.12)	$ 0.04

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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