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Net income per share (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Numerator:
Net income	$ 12,147,088	$ 1,817,672
Convertible note interest	117,421
Adjusted diluted net income	$ 12,264,509	$ 1,817,672
Denominator: Weighted average common shares outstanding used in computing net income per share:
Basic	5,793,245	5,554,541
Effect of dilutive stock options and convertible notes payable	1,026,576	351,695
Diluted	6,819,821	5,906,236
Net income per share applicable to common stockholders:
Basic	$ 2.10	$ 0.33
Diluted	$ 1.80	$ 0.31

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