FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

3 Months Ended

Mar. 31, 2019

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
Description	Total March 31, 2019		Quoted Prices   in Active Markets for   Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents:
Time deposits	$	50,000	$	-	$	50,000	$	-
Money market mutual funds		659,000		659,000		-		-
US T-bills		17,529,000		17,529,000
Marketable securities:
Corporate debt securities		562,000		-		562,000		-
Marketable equity securities		3,045,000		3,045,000		-		-
Total assets	$	21,845,000	$	21,233,000	$	612,000	$	-

	Fair value measurement at reporting date using
Description	Total December 31, 2018		Quoted Prices   in Active Markets for   Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents:
Time deposits	$	355,000	$	-	$	355,000	$	-
Money market mutual funds		1,594,000		1,594,000		-		-
US T-bills		17,429,000		17,429,000
Marketable securities:
Corporate debt securities		502,000		-		502,000		-
Marketable equity securities		2,574,000		2,574,000		-		-
Total assets	$	22,454,000	$	21,597,000	$	857,000	$	-