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Net Income (Loss) per Share Applicable to Common Stockholders (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net income (loss)	$ (45,257)	$ 414,101	$ (408,528)	$ 1,289,831
Denominator: Weighted average common shares outstanding used in computing net income (loss) per share:
Basic	5,883,109	6,261,460	6,166,017	6,047,869
Effect of dilutive stock options		868,173		888,341
Diluted	5,883,109	7,129,633	6,166,017	6,936,210
Net income (loss) per share applicable to common stockholders:
Basic	$ (0.01)	$ 0.07	$ (0.07)	$ 0.21
Diluted	$ (0.01)	$ 0.06	$ (0.07)	$ 0.19

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