SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Schedule of antidilutive securities) (Details) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Summary of antidilutive securities excluded from computation of earnings per share
Total potentially dilutive common shares	10,454,812	12,253,812
Series C Convertible Preferred Stock and related accrued dividends [Member]
Summary of antidilutive securities excluded from computation of earnings per share
Total potentially dilutive common shares	524,736	524,736
Series D Convertible Preferred Stock [Member]
Summary of antidilutive securities excluded from computation of earnings per share
Total potentially dilutive common shares	3,628,576	3,628,576
Stock options to purchase common stock [Member]
Summary of antidilutive securities excluded from computation of earnings per share
Total potentially dilutive common shares	6,301,500	8,100,500