FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value, by Balance Sheet Grouping [Table Text Block]

 Assets and liabilities measured at fair value on a recurring basis are summarized below:

	Fair value measurement at reporting date using
	Total		Quoted Prices in Active		Significant Other		Significant
	March 31,		Markets for Identical Assets		Observable Inputs		Unobservable Inputs
Description	2018		(Level 1)		(Level 2)		(Level 3)
Assets:
Cash equivalents:
Time deposits	$	50,000		-	$	50,000	$	-
Money market mutual funds		1,404,000		1,404,000		-		-
US T-bills		17,893,000		17,893,000
Marketable securities:
Corporate debt securities		556,000		-		556,000		-
Marketable equity securities		4,603,000		4,603,000		-		-
Total assets	$	24,506,000	$	23,900,000	$	606,000	$	-

	Fair value measurement at reporting date using
	Total		Quoted Prices in Active		Significant Other		Significant
	December 31,		Markets for Identical Assets		Observable Inputs		Unobservable Inputs
Description	2017		(Level 1)		(Level 2)		(Level 3)
Assets:
Cash equivalents:
Time deposits	$	352,000	$	-	$	352,000	$	—
Money market mutual funds		1,633,000		1,633,000		—		—
US T-bills		2,935,000		2,935,000		—		—
Marketable securities:
Corporate debt securities		517,000		—		517,000		—
Marketable equity securities		4,033,000		4,033,000		—		—
Total assets	$	9,470,000	$	8,601,000	$	869,000	$	—