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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)