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LONG-TERM DEBT (Financed Insurance Loan) (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Jul. 31, 2019
Jul. 31, 2018
Debt Instrument [Line Items]        
Total debt $ 1,022,000 $ 519,000    
Financed Insurance Loan [Member]        
Debt Instrument [Line Items]        
Debt instrument, face amount     $ 400,000 $ 400,000
Interest rate (as a percent)     5.00% 4.89%
Total debt $ 0 $ 260,000