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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings per share (Details) - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Earnings per share    
Stock options excluded from calculation of diluted EPS 148,000 1,400,000
Net loss $ (1,189,945) $ (939,091)
Preferred dividend requirements (176,249) (176,249)
Loss applicable to common shareholders $ (1,366,194) $ (1,115,340)
Average common shares outstanding 31,333,121 28,624,874
Average common and common equivalent shares outstanding - assuming dilution 31,333,121 28,624,874
Basic loss per share (in dollars per share) $ (0.04) $ (0.04)
Diluted loss per share (in dollars per share) $ (0.04) $ (0.04)