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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings per share (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Earnings per share        
Common Stock underlying issued and outstanding stock options 78,322 139,119 88,347 144,376
Common stock issuable upon the conversion of convertible preferred shares 232,445 236,445 232,445 236,445
Diluted EPS calculated under the treasury stock method 310,767 375,564 320,792 380,821
Net income (loss) $ (3,641,597) $ 10,662,125 $ 3,974,858 $ 28,618,009
Preferred stock dividend requirements (58,111) (59,170) (116,222) (124,108)
Net income (loss) applicable to common shareholders $ (3,699,708) $ 10,602,955 $ 3,858,636 $ 28,493,901
Average common shares outstanding 32,945,821 34,000,771 33,105,637 33,984,271
Average common and common equivalent shares outstanding - assuming dilution 33,256,588 34,376,335 33,426,429 34,365,092
Basic earnings (loss) per share $ (0.11) $ 0.31 $ 0.12 $ 0.84
Diluted earnings (loss) per share $ (0.11) $ 0.31 $ 0.12 $ 0.83