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Net income per share (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Numerator:
Net income	$ 1,817,672	$ 432,117
Denominator: Weighted average common shares outstanding used in computing net income per share:
Basic	5,554,541	5,005,579
Effect of dilutive stock options and warrants (treasury stock method)	$ 420,511	$ 245,335
Diluted	5,975,052	5,250,914
Net income per share applicable to common stockholders:
Basic	$ 0.33	$ 0.09
Diluted	$ 0.30	$ 0.08

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Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of dilutive convertible securities excluding adjustments related to ESOP convertible preferred stock, stock options, and restrictive stock units.

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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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