EARNINGS PER SHARE - Basic earnings per share of common stock (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Basic and diluted earnings per share:
Net income	$ 375,009	$ 888,440	$ 915,274	$ 1,962,090
Weighted average common shares outstanding, basic	2,860,352	2,850,124	2,857,759	2,847,042
Weighted average common shares outstanding, diluted	2,860,352	2,850,124	2,857,759	2,847,042
Net income per share (basic)	$ 0.13	$ 0.31	$ 0.32	$ 0.69
Net income per share (diluted)	$ 0.13	$ 0.31	$ 0.32	$ 0.69
Options outstanding	0	0	0	0