SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings per share (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Earnings per share
Common stock underlying issued and outstanding stock options		15,040	65,597
Diluted EPS calculated under the treasury stock method		15,040	65,597
Net Income (Loss)	$ (11,886,524)	$ (7,011,036)	$ 5,078,557
Preferred stock dividend requirements	(230,444)	(231,946)	(232,444)
Income (loss) applicable to common shareholders	$ (12,116,968)	$ (7,242,982)	$ 4,846,113
Average common shares outstanding	29,937,159	29,937,159	32,896,348
Average common and common equivalent shares outstanding - diluted	29,937,159	29,937,159	32,961,945
Basic earnings (loss) per share	$ (0.4)	$ (0.24)	$ 0.15
Diluted earnings (loss) per share	$ (0.4)	$ (0.24)	$ 0.15