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Marketable Securities and Investments | 12 Months Ended
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May 31, 2014
Investments, Debt and Equity Securities [Abstract] |
MARKETABLE SECURITIES AND INVESTMENTS | MARKETABLE SECURITIES AND INVESTMENTS As of May 31, 2014, marketable securities consisted of the following:
| Amortized cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
| (in thousands)
Available-for-sales securities |  |  |  |  |  |  |
U.S. government agency obligations | $ | 1,825 |  |  | $ | — |  |  | $ | (16 | ) |  | $ | 1,809 |
Corporate bond securities | — |  |  | — |  |  | — |  |  | — |
| $ | 1,825 |  |  | $ | — |  |  | $ | (16 | ) |  | $ | 1,809 |
As of May 31, 2013, marketable securities consisted of the following:
| Amortized cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
| (in thousands)
Available-for-sales securities |  |  |  |  |  |  |
U.S. government agency obligations | $ | 1,850 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,850 |
Corporate bond securities | 303 |  |  | — |  |  | — |  |  | 303 |
| $ | 2,153 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,153 |
The amortized cost and fair value of marketable securities as of May 31, 2014, by contractual maturity, are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
| Amortized cost |  | Fair Value
| (in thousands)
As of May 31, 2014: |  |  |
Due in one year or less | $ | — |  |  | $ | — |
Due after one through five years | — |  |  | — |
Due after five through twenty years | 1,825 |  |  | 1,809 |
| $ | 1,825 |  |  | $ | 1,809 |

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Equity Security -URI http://asc.fasb.org/extlink&oid=6511694 + Details
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