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LONG-TERM DEBT (Settlement Agreement) (Details) - USD ($)
Sep. 21, 2018
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]      
Total debt   $ 210,000 $ 1,010,000
Settlement Agreements      
Debt Instrument [Line Items]      
Frequency of periodic payment monthly    
Debt instrument, term 2 years    
Date of first required payment Nov. 01, 2018    
Maturity date Nov. 01, 2020    
Debt instrument, face amount $ 100,000    
Interest rate (as a percent) 10.00%    
Total debt   $ 0 $ 0