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Marketable Securities (Details 1) - USD ($) $ in Thousands	May 31, 2018	May 31, 2017
Amortized cost and fair value of marketable securities by contractual maturity
Amortized cost, Due in one year or less	$ 0
Amortized cost, Due after one through five years	0
Amortized cost, Due after five through twenty years	1,350
Amortized Cost	1,350	$ 1,350
Fair Value, Due in one year or less	0
Fair Value, Due after one through five years	0
Fair Value, Due after five through twenty years	1,317
Fair Value, Total	$ 1,317

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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