EARNINGS PER SHARE - Earnings per Share (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 2,808,643	$ 1,551,671
Less dividends:
Common stock	2,244,904	1,870,416
Preferred stock	3,708	3,750
Dividends	2,248,612	1,874,166
Undistributed earnings (deficit)	$ 560,031	$ (322,495)
Common Stock
Less dividends:
Distributed earnings (in dollars per share)	$ 0.09	$ 0.08
Undistributed earnings (deficit) (in dollars per share)	0.02	(0.02)
Total (in dollars per share)	0.11	0.06
Unvested Share-Based Payment Awards
Less dividends:
Distributed earnings (in dollars per share)	0.09	0.08
Undistributed earnings (deficit) (in dollars per share)	0.02	0
Total (in dollars per share)	$ 0.11	$ 0.08