INVESTMENTS IN MARKETABLE SECURITIES (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Marketable Securities Purchases Of Company Details [Line Items]
Investments In Marketable Securities	$ 3,100,000		$ 3,100,000		$ 2,960,000
Marketable Securities Gain	44,000	$ 220,000	68,000	$ 313,000
Marketable Securities Loss	5,000	105,000	33,000	287,000
Marketable Securities, Realized Gain (Loss)	$ 39,000	$ 115,000	$ 35,000	$ 26,000