SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings per share (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings per share
Stock options excluded from calculation of diluted EPS			27,425	147,775
Net loss	$ (947,706)	$ (1,349,346)	$ (1,126,990)	$ (2,539,291)
Preferred stock dividend requirements	(176,249)	(176,249)	(352,498)	(352,498)
Loss applicable to common shareholders	$ (1,123,955)	$ (1,525,595)	$ (1,479,488)	$ (2,891,789)
Average common shares outstanding	32,666,454	31,666,454	32,666,454	31,499,787
Average common and common equivalent shares outstanding - assuming dilution	32,666,454	31,666,454	32,666,454	31,499,787
Basic loss per share (in dollars per share)	$ (0.03)	$ (0.05)	$ (0.05)	$ (0.09)
Diluted loss per share (in dollars per share)	$ (0.03)	$ (0.05)	$ (0.05)	$ (0.09)