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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings per share (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Earnings per share        
Common Stock underlying issued and outstanding stock options 6,408 60,462 17,904 76,370
Common stock issuable upon the conversion of convertible preferred shares 232,445 232,445 232,445 232,445
Diluted EPS calculated under the treasury stock method 238,853 292,907 250,349 308,815
Net Income $ (4,060,496) $ 5,385,254 $ (6,938,090) $ 9,360,113
Preferred stock dividend requirements (58,111) (58,111) (174,335) (174,333)
Net income (loss) applicable to common shareholders $ (4,118,607) $ 5,327,143 $ (7,112,425) $ 9,185,780
Average common shares outstanding 29,937,159 32,936,959 29,937,159 33,049,411
Average common and common equivalent shares outstanding - assuming dilution 29,937,159 33,229,866 29,937,159 33,358,225
Basic earnings (loss) per share $ (0.14) $ 0.16 $ (0.24) $ 0.28
Diluted earnings (loss) per share $ (0.14) $ 0.16 $ (0.24) $ 0.28