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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings per share (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings per share      
Diluted EPS calculated under the treasury stock method 131,347    
Stock options excluded from calculation of diluted EPS   639,300 1,357,803
Net income (loss) $ 24,223,013 $ 3,148,234 $ (1,339,943)
Preferred stock dividend requirements (573,868) (702,618) (704,996)
Deemed contribution on extinguishment of preferred stock 2,975,708    
Income (loss) applicable to common shareholders $ 26,624,853 $ 2,445,616 $ (2,044,939)
Weighted Average common shares outstanding 33,169,307 32,672,475 32,666,454
Weighted Average common and common equivalent shares outstanding - assuming dilution 33,300,654 32,672,475 32,666,454
Basic earnings (loss) per share $ 0.80 $ 0.07 $ (0.06)
Diluted earnings (loss) per share $ 0.80 $ 0.07 $ (0.06)