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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

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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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