SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings per share (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings per share
Common Stock underlying issued and outstanding stock options	65,597	141,435	131,347
Common stock issuable upon the conversion of convertible preferred shares		232,445
Diluted EPS calculated under the treasury stock method	65,597	373,880	131,347
Net income	$ 5,078,557	$ 56,064,241	$ 24,223,013
Preferred stock dividend requirements	(232,444)	(241,703)	(573,868)
Deemed contribution on extinguishment of preferred stock			2,975,708
Net income applicable to common shareholders	$ 4,846,113	$ 55,822,538	$ 26,624,853
Average common shares outstanding	32,896,348	33,870,819	33,169,307
Average common and common equivalent shares outstanding - assuming dilution	32,961,945	34,244,699	33,300,654
Basic earnings per share	$ 0.15	$ 1.65	$ 0.80
Diluted earnings per share	$ 0.15	$ 1.63	$ 0.80