FAIR VALUE INSTRUMENTS (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

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

For the year ended December 31, 2018 and 2017, there were no major assets or liabilities measured at fair value on a recurring basis which uses significant unobservable inputs (Level 3):

	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	$	—

	Fair value measurement at reporting date using
Description	Total December 31, 2017		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	$	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	$	—