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Investments (Tables) | 12 Months Ended
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May 31, 2014
Text Block [Abstract] |
Summary of Investments | The following is a summary of investments:
|  | Gross Amortized Costs |  |  | Gross Unrealized Gains |  |  | Fair Value |
|  | (Dollars in thousands) |
May 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |
U. S. Treasury Bills |  | $ | — |  |  | $ | — |  |  | $ | — |
May 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |
U. S. Treasury Bills |  | $ | 4,000 |  |  | $ | — |  |  | $ | 4,000 |

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