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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings per share (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings per share        
Additional stock options included in calculation of diluted EPS 142,552 226,150 143,780 226,150
Common stock issuable upon the conversion of convertible preferred shares 236,445   236,445  
Net income $ 6,521,885 $ 8,625,751 $ 35,139,894 $ 12,714,637
Preferred stock dividend requirements (59,111) (145,535) (183,219) (493,826)
Deemed contribution on extinguishment of preferred stock   2,525,848   2,519,124
Income applicable to common shareholders $ 6,462,774 $ 11,006,064 $ 34,956,675 $ 14,739,935
Average common shares outstanding 33,883,684 33,371,471 33,950,742 32,947,241
Average common and common equivalent shares outstanding - assuming dilution 34,262,681 33,984,934 34,330,967 33,071,652
Basic earnings per share $ 0.19 $ 0.33 $ 1.03 $ 0.45
Diluted earnings per share $ 0.19 $ 0.33 $ 1.02 $ 0.45