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INVESTMENTS, AVAILABLE-FOR-SALE SECURITIES (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Available-for-sale Securities Reconciliation [Abstract]
Amortized cost	$ 11,242,000	$ 15,942,000
Gross unrealized gains	728,000	610,000
Gross unrealized losses	(888,000)	(1,045,000)
Fair value	11,082,000	15,507,000
Available-For-Sale Securities, Unrealized Loss Positions [Abstract]
Continuous unrealized loss position, 12 months or more, aggregated fair value	9,911,000	14,455,000
Continuous unrealized loss position, 12 months or more, gross unrealized losses	(888,000)	(1,045,000)
Continuous unrealized loss position, less than 12 months, accumulated loss	0	0
Auction Rate Securities [Member]
Available-for-sale Securities Reconciliation [Abstract]
Amortized cost	11,242,000	15,942,000
Gross unrealized gains	728,000	610,000
Gross unrealized losses	(888,000)	(1,045,000)
Fair value	11,082,000	15,507,000
Available-For-Sale Securities, Unrealized Loss Positions [Abstract]
Continuous unrealized loss position, 12 months or more, aggregated fair value	9,911,000	14,455,000
Continuous unrealized loss position, 12 months or more, gross unrealized losses	$ (888,000)	$ (1,045,000)

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