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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings per share (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings per share
Stock options excluded from calculation of diluted EPS				27,000
Net income (loss)	$ 391,752	$ (947,706)	$ 262,531	$ (1,126,990)
Preferred stock dividend requirements	(175,456)	(176,249)	(351,705)	(352,498)
Income (loss) applicable to common shareholders	$ 216,296	$ (1,123,955)	$ (89,174)	$ (1,479,488)
Average common shares outstanding	32,673,537	32,666,454	32,669,996	32,666,454
Average common and common equivalent shares outstanding - assuming dilution	32,673,537	32,666,454	32,669,996	32,666,454
Basic income (loss) per share (in dollars per share)	$ 0.01	$ (0.03)	$ 0.00	$ (0.05)
Diluted income (loss) per share (in dollars per share)	$ 0.01	$ (0.03)	$ 0.00	$ (0.05)

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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