3. CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables)

3 Months Ended

Aug. 31, 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 August 31, 2018 (in thousands):

	Cost		Gross Unrealized Loss		Estimated Fair Value
Cash	$	2,587	$	--	$	2,587
Cash equivalents:
Money market funds		13,277		--		13,277
U.S. Treasury securities		--		--		--
Total Cash equivalents		13,277		--		13,277
Total Cash and Cash equivalents	$	15,864	$	--	$	15,864
Long-term investments:
Certificate of deposit	$	80	$	--	$	80
Total Cash, Cash equivalents and Investments	$	15,944	$	--	$	15,944

    The following table summarizes the Company’s cash, cash equivalents and investments by security type at May 31, 2018 (in thousands):

	Cost		Gross Unrealized Loss		Estimated Fair Value
Cash	$	3,132	$	--	$	3,132
Cash equivalents:
Money market funds		7,733		--		7,733
U.S. Treasury securities		5,983		--		5,983
Total Cash equivalents		13,716		--		13,716
Total Cash and Cash equivalents	$	16,848	$	0	$	16,848
Long-term investments:
Certificate of deposit	$	80	$	--	$	80
Total Cash, Cash equivalents and Investments	$	16,928	$	--	$	16,928