SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - weighted average dilutive common shares (Details) - shares	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,492,625	1,532,850
Series B Convertible Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	698,600	724,350
Series C Convertible Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	189,000	206,800
options
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	395,000	400,000
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	210,025	201,700