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Basic and Diluted Net Income per Share (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Basic and Diluted Net Income per Share
Net income	$ 2,088,841	$ 1,354,968	$ 3,934,406	$ 2,196,164
Weighted-average shares outstanding - Basic (in shares)	11,163,506	10,651,619	11,096,942	10,630,123
Effect of dilutive securities:
Underwriters' warrants	92,898	78,351	96,482	67,533
Stock Options	880,908	1,186,412	938,135	1,174,362
Restricted Stock Units	89,348	95,093	96,390	81,468
Weighted-average shares outstanding - Diluted (in shares)	12,226,660	12,011,475	12,227,949	11,953,486
Basic net income per share (in dollars per share)	$ 0.19	$ 0.13	$ 0.35	$ 0.21
Diluted net income per share (in dollars per share)	$ 0.17	$ 0.11	$ 0.32	$ 0.18
Anti-dilutive stock
Anti-dilutive stock options and restricted stock units	6,639	44,123	6,895	46,039

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