4. CASH, CASH EQUIVALENTS AND INVESTMENTS

6 Months Ended

Nov. 30, 2017

Cash and Cash Equivalents [Abstract]

4. CASH, CASH EQUIVALENTS AND INVESTMENTS

4. CASH, CASH EQUIVALENTS AND INVESTMENTS

    The following table summarizes the Company’s cash, cash equivalents and investments by security type at November 30, 2017 (in thousands):

	Cost		Gross Unrealized Loss		Estimated Fair Value
Cash	$	1,802	$	--	$	1,802
Cash equivalents:
Money market funds		4,164		--		4,164
U.S. Treasury securities		3,993		--		3,993
Total Cash equivalents		8,157		--		8,157
Total Cash and Cash equivalents	$	9,959	$	--	$	9,959
Short-term investments:
U.S. Treasury securities	$	5,972	$	3	$	5,969
Total Cash, Cash equivalents and Investments	$	15,931	$	3	$	15,928

    Unrealized gains and temporary losses on investments classified as available-for-sale are included within accumulated other comprehensive income (“AOCI”), net of any related tax effect. Upon realization, those amounts are reclassified from AOCI to results of operations.

    The unrealized loss as of November 30, 2017 is not considered other-than-temporary.