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CONVERTIBLE NOTES (Convertible Promissory Notes) (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jan. 15, 2019
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Apr. 16, 2019
Jan. 29, 2019
Debt Instrument [Line Items]              
Payments on notes     $ 284,000 $ 231,000      
Conversion of interest on convertible debt into common stock     1,938,000 7,272,000      
Proceeds from issuance of common stock     2,607,000 2,410,000      
Proceeds from issuance of debt       2,150,000      
Leviston Note [Member]              
Debt Instrument [Line Items]              
Outstanding debt     $ 0   $ 0    
Crede Note              
Debt Instrument [Line Items]              
Payments on notes   $ 0   0      
Number of shares converted from debt instrument (in shares)     270,699   270,699    
Outstanding debt     $ 0     $ 1,450,000  
Issuance of convertible notes $ 1,450,000            
Conversion price based on closing bid price of common stock on the date prior to each conversion date (as a percent) 90.00%            
Proceeds from issuance of common stock $ 4,000,000            
Beneficial Ownership Cap 4.99%            
Leviston Resources LLC              
Debt Instrument [Line Items]              
Payments on notes   0          
Conversion of interest on convertible debt into common stock   $ 500,000   $ 700,000      
Number of shares converted from debt instrument (in shares)   111,023   184,357      
Settled Litigation | Leviston Resources LLC              
Debt Instrument [Line Items]              
Issuance of convertible notes             $ 700,000
Maximum | Crede Note              
Debt Instrument [Line Items]              
New shares issued (in shares)     10,000        
Percentage of daily average composite trading volume     10.00%        
Maximum | Leviston Resources LLC              
Debt Instrument [Line Items]              
Payments on notes       $ 100,000