INVESTMENTS (Details 1) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 1,542,000	$ 7,330,000
Unrealized Gain	9,000	27,000
Unrealized Loss	0	(42,000)
Fair Value	1,551,000	7,315,000
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	100,000	3,259,000
Unrealized Gain	4,000	26,000
Unrealized Loss	0	(36,000)
Fair Value	104,000	3,249,000
Long-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	1,442,000	4,071,000
Unrealized Gain	5,000	1,000
Unrealized Loss	0	(6,000)
Fair Value	1,447,000	4,066,000
U.S. Treasury Notes [Member] | Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		680,000
Unrealized Gain		0
Unrealized Loss		0
Fair Value		680,000
U.S. Treasury Notes [Member] | Long-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	935,000	2,165,000
Unrealized Gain	4,000	0
Unrealized Loss	0	(3,000)
Fair Value	939,000	2,162,000
Mutual funds [Member] | Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		1,706,000
Unrealized Gain		0
Unrealized Loss		(36,000)
Fair Value		1,670,000
Corporate bonds and commercial paper [Member] | Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	51,000	824,000
Unrealized Gain	0	1,000
Unrealized Loss	0	0
Fair Value	51,000	825,000
Corporate bonds and commercial paper [Member] | Long-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	357,000	1,155,000
Unrealized Gain	1,000	1,000
Unrealized Loss	0	0
Fair Value	358,000	1,156,000
Government agency bonds [Member] | Long-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	150,000	751,000
Unrealized Gain	0	0
Unrealized Loss	0	(3,000)
Fair Value	150,000	748,000
Common Stock [Member] | Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	49,000	49,000
Unrealized Gain	4,000	25,000
Unrealized Loss	0	0
Fair Value	$ 53,000	$ 74,000