5. CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables)

6 Months Ended

Nov. 30, 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 November 30, 2018 (in thousands):

	Cost		Gross Unrealized Loss		Estimated Fair Value
Cash	$	1,961	$	--	$	1,961
Cash equivalents:
Money market funds		6,050		--		6,050
U.S. Treasury securities		5,991		--		5,991
Total Cash equivalents		12,041		--		12,041
Total Cash and Cash equivalents	$	14,002	$	--	$	14,002
Long-term investments:
Certificate of deposit	$	80	$	--	$	80
Total Cash, Cash equivalents and Investments	$	14,082	$	--	$	14,082

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	$	--	$	16,848
Long-term investments:
Certificate of deposit	$	80	$	--	$	80
Total Cash, Cash equivalents and Investments	$	16,928	$	--	$	16,928