INVESTMENTS IN MARKETABLE SECURITIES (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Marketable Securities Purchases Of Company Details [Line Items]
Investments In Marketable Securities	$ 3,090,000		$ 3,090,000		$ 2,960,000
Marketable Securities Gain		$ 27,000	25,000	$ 93,000
Marketable Securities Loss		98,000	29,000	182,000
Marketable Securities, Realized Gain (Loss), Total	$ 4,000	$ (71,000)	$ (4,000)	$ (89,000)