INVESTMENTS HELD-TO-MATURITY (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Investments [Abstract]
Held-to-maturity, fair value		$ 6,500,000		$ 6,500,000
Held-to-maturity, amortized cost	$ 0	4,500,000	$ 0	4,500,000	$ 0
Held-to-maturity, unrealized gain		0		0
Held-to-maturity, unrealized loss		0		0
Interest and investment income	$ 7,000	$ 72,000	$ 64,000	$ 178,000