OTHER INVESTMENTS (Details 1) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Fair Value
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 0	$ 138,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	121,000	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total	121,000	138,000
Unrealized Loss
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	0	(24,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	(42,000)	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss, Total	(42,000)	(24,000)
Partnerships Owning Investments In Technology Related Industries [Member]
Fair Value
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	138,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	121,000	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total	121,000	138,000
Unrealized Loss
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	0	(24,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	(42,000)	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss, Total	$ (42,000)	$ (24,000)