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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings per share (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings per share
Stock options excluded from calculation of diluted EPS	382,800	1,357,803
Net income (loss)	$ 322,773	$ (129,221)
Preferred stock dividend requirements	(174,143)	(176,249)
Income (loss) applicable to common shareholders	$ 148,630	$ (305,470)
Weighted average common shares outstanding	32,681,204	32,666,454
Weighted average common and common equivalent shares outstanding - assuming dilution	32,745,972	32,666,454
Basic earnings (loss) per share	$ 0.00	$ (0.01)
Diluted earnings (loss) per share	$ 0.00	$ (0.01)

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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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