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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings per share (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings per share
Additional stock options included in calculation of diluted EPS	152,967
Common stock issuable upon the conversion of convertible preferred shares	257,945
Net income	$ 17,955,884	$ 322,773
Preferred stock dividend requirements	(64,938)	(174,143)
Income applicable to common shareholders	$ 17,890,946	$ 148,630
Average common shares outstanding	33,967,771	32,681,204
Average common and common equivalent shares outstanding - assuming dilution	34,378,683	32,745,972
Basic earnings per share	$ 0.53	$ 0.00
Diluted earnings per share	$ 0.52	$ 0.00

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