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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loss per share (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Loss per share
Stock options excluded from calculation of diluted loss per share			147,775	678,349
Net loss	$ (1,349,346)	$ (656,694)	$ (2,539,291)	$ (1,595,785)
Preferred dividend requirements	(176,249)	(176,249)	(352,498)	(352,498)
Loss applicable to common shareholders	$ (1,525,595)	$ (832,943)	$ (2,891,789)	$ (1,948,283)
Average common shares outstanding	31,666,454	29,483,207	31,499,787	29,054,041
Average common and common equivalent shares outstanding - assuming dilution	31,666,454	29,483,207	31,499,787	29,054,041
Basic loss per share (in dollars per share)	$ (0.05)	$ (0.03)	$ (0.09)	$ (0.07)
Diluted loss per share (in dollars per share)	$ (0.05)	$ (0.03)	$ (0.09)	$ (0.07)

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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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