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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings per share (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings per share      
Stock options excluded from calculation of diluted EPS 79,441 783,730  
Net loss $ (3,736,038) $ (3,694,907) $ 4,314,318
Preferred dividend requirements (704,996) (704,996) (709,351)
Deemed capital contribution on extinguishment of preferred stock     2,305,678
Income (loss) applicable to common shareholders $ (4,441,034) $ (4,399,903) $ 5,910,645
Weighted average common shares outstanding 31,958,121 29,354,437 27,822,593
Weighted average common and common equivalent shares outstanding - assuming dilution 31,958,121 29,354,437 29,481,294
Basic loss per share (in dollars per share) $ (0.14) $ (0.15) $ 0.21
Diluted loss per share (in dollars per share) $ (0.14) $ (0.15) $ 0.20