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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings per share (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings per share
Stock options excluded from calculation of diluted EPS									639,000	1,357,803	79,441
Net income (loss)	$ 1,861,000	$ 1,025,000	$ 392,000	$ (129,000)	$ (150,000)	$ (63,000)	$ (948,000)	$ (179,000)	$ 3,148,234	$ (1,339,943)	$ (3,736,038)
Preferred dividend requirements	(177,000)	(175,000)	(175,000)	(176,000)	(177,000)	(176,000)	(176,000)	(176,000)	(702,618)	(704,996)	(704,996)
Income (loss) applicable to common shareholders	$ 1,684,000	$ 850,000	$ 217,000	$ (306,000)	$ (327,000)	$ (239,000)	$ (1,124,000)	$ (355,000)	$ 2,445,616	$ (2,044,939)	$ (4,441,034)
Weighted average common shares outstanding	32,674,954	32,674,954	32,674,954	32,666,454	32,666,454	32,666,454	32,666,454	32,666,454	32,672,475	32,666,454	31,958,121
Weighted average common and common equivalent shares outstanding - assuming dilution	32,710,248	32,674,954	32,674,954	32,666,454	32,666,454	32,666,454	32,666,454	32,666,454	32,672,475	32,666,454	31,958,121
Basic earnings (loss) per share	$ 0.05	$ 0.03	$ 0.01	$ (0.01)	$ (0.01)	$ (0.01)	$ (0.03)	$ (0.01)	$ 0.07	$ (0.06)	$ (0.14)
Diluted earnings (loss) per share	$ 0.05	$ 0.03	$ 0.01	$ (0.01)	$ (0.01)	$ (0.01)	$ (0.03)	$ (0.01)	$ 0.07	$ (0.06)	$ (0.14)

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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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