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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings per share (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings per share
Net income (loss)	$ 1,024,434	$ (63,417)	$ 1,286,965	$ (1,190,407)
Preferred stock dividend requirements	(175,456)	(176,249)	(527,162)	(528,747)
Income (loss) applicable to common shareholders	$ 848,978	$ (239,666)	$ 759,803	$ (1,719,154)
Average common shares outstanding	32,674,954	32,666,454	32,671,648	32,666,454
Average common and common equivalent shares outstanding - assuming dilution	32,674,954	32,666,454	32,671,648	32,666,454
Basic income (loss) per share (in dollars per share)	$ 0.03	$ (0.01)	$ 0.02	$ (0.05)
Diluted income (loss) per share (in dollars per share)	$ 0.03	$ (0.01)	$ 0.02	$ (0.05)

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