4. CASH, CASH EQUIVALENTS AND INVESTMENTS

9 Months Ended

Feb. 28, 2018

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 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

    Long-term investments are included in other assets on the accompanying condensed consolidated balance sheets.

    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 February 28, 2018 is not considered other-than-temporary, and has been in an unrealized loss position for less than a year.