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Marketable Securities (Details 1) - USD ($) $ in Thousands | May 31, 2018 | May 31, 2017
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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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