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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings per share (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings per share
Stock options excluded from calculation of diluted EPS		79,441
Net loss	$ (1,339,943)	$ (3,736,038)	$ (3,694,907)
Preferred stock dividend requirements	(704,996)	(704,996)	(704,996)
Loss applicable to common shareholders	$ (2,044,939)	$ (4,441,034)	$ (4,399,903)
Weighted average common shares outstanding	32,666,454	31,958,121	29,354,437
Weighted average common and common equivalent shares outstanding - assuming dilution	32,666,454	31,958,121	29,354,437
Basic loss per share (in dollars per share)	$ (0.06)	$ (0.14)	$ (0.15)
Diluted loss per share (in dollars per share)	$ (0.06)	$ (0.14)	$ (0.15)

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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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