4. CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables)

9 Months Ended

Feb. 28, 2018

Cash and Cash Equivalents [Abstract]

Cash, cash equivalents and investments by security type

    The following table summarizes the Company’s cash, cash equivalents and investments by security type at February 28, 2018 (in thousands):

	Cost		Gross Unrealized Loss		Estimated Fair Value
Cash	$	1,899	$	--	$	1,899
Cash equivalents:
Money market funds		7,178		--		7,178
U.S. Treasury securities		--		--		--
Total Cash equivalents		7,178		--		7,178
Total Cash and Cash equivalents	$	9,077	$	--	$	9,077
Short-term investments:
U.S. Treasury securities	$	5,989	$	3	$	5,986
Long-term investments:
Certificate of deposit	$	80		--	$	80
Total Cash, Cash equivalents and Investments	$	15,146	$	3	$	15,143