EARNINGS PER SHARE - Basic earnings per share of common stock (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Basic earnings per share:
Net income	$ 435,021	$ 230,733
Weighted average common shares outstanding, basic	2,867,082	2,855,253
Weighted average common shares outstanding, diluted	2,867,082	2,855,253
Net income per share (basic)	$ 0.15	$ 0.08
Net income per share (diluted)	$ 0.15	$ 0.08
Options outstanding	0	0