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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings per share (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings per share      
Common Stock underlying issued and outstanding stock options 141,435 131,347 639,300
Common stock issuable upon the conversion of convertible preferred shares 232,445    
Diluted EPS calculated under the treasury stock method 373,880 131,347 639,300
Net income $ 56,064,241 $ 24,223,013 $ 3,148,234
Preferred stock dividend requirements (241,703) (573,868) (702,618)
Deemed contribution on extinguishment of preferred stock   2,975,708  
Net income applicable to common shareholders $ 55,822,538 $ 26,624,853 $ 2,445,616
Average common shares outstanding 33,870,819 33,169,307 32,672,475
Average common and common equivalent shares outstanding - assuming dilution 34,244,699 33,300,654 32,672,475
Basic earnings per share $ 1.65 $ 0.80 $ 0.07
Diluted earnings per share $ 1.63 $ 0.80 $ 0.07