INVESTMENTS IN MARKETABLE SECURITIES (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Marketable Securities Purchases Of Company Details [Line Items]
Investments In Marketable Securities	$ 3,080,000		$ 2,960,000
Marketable Securities Gain	21,000	$ 66,000
Marketable Securities Loss	29,000	84,000
Marketable Securities, Realized Gain (Loss), Total	$ (8,000)	$ (18,000)