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INVESTMENTS (Scheduled Maturities of Investments Classified as Available-for-sale) (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]      
Realized gain on investments $ 0 $ 0 $ 0
Realized loss on investments 0 0 $ 0
Debt Maturities Fair Value [Abstract]      
2020 0    
2021 — 2024 0    
2025 — 2029 0    
2030 and thereafter 10,070,000    
Available-for-sale investments $ 10,070,000 $ 10,070,000