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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings per share (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings per share
Additional stock options included in calculation of diluted EPS	347,950		347,950
Net Income	$ 3,766,113	$ 391,752	$ 4,088,886	$ 262,531
Preferred dividend requirements	(174,148)	(175,456)	(348,291)	(351,705)
Income (loss) applicable to common shareholders	$ 3,591,965	$ 216,296	$ 3,740,595	$ (89,174)
Weighted average common shares outstanding	32,789,047	32,673,537	32,735,126	32,669,996
Weighted average common and common equivalent shares outstanding - assuming dilution	32,985,381	32,673,537	32,856,003	32,669,996
Basic earnings (loss) per share	$ 0.11	$ 0.01	$ 0.11	$ 0.00
Diluted earnings (loss) per share	$ 0.11	$ 0.01	$ 0.11	$ 0.00

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