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Marketable Securities (Tables) | 12 Months Ended
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May 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Marketable securities | As of May 31, 2018, marketable securities consisted of the following:
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
(in thousands) |
Available-for-sales securities |  |  |  |  |  |  |
New York State government agency obligations | $ | 1,350 |  |  | $ | — |  |  | $ | (33 | ) |  | $ | 1,317 |
| $ | 1,350 |  |  | $ | — |  |  | $ | (33 | ) |  | $ | 1,317 |
As of May 31, 2017, marketable securities consisted of the following:
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
(in thousands) |
Available-for-sales securities |  |  |  |  |  |  |
New York State government agency obligations | $ | 1,350 |  |  | $ | — |  |  | $ | (135 | ) |  | $ | 1,215 |
| $ | 1,350 |  |  | $ | — |  |  | $ | (135 | ) |  | $ | 1,215 |
Amortized cost and fair value of marketable securities by contractual maturity | The amortized cost and fair value of marketable securities as of May 31, 2018, 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, 2018: |  |  |
Due in one year or less | $ | — |  |  | $ | — |
Due after one through five years | — |  |  | — |
Due after five through twenty years (1) | 1,350 |  |  | 1,317 |
| $ | 1,350 |  |  | $ | 1,317 |
(1) This auction rate security represents investments available for current operations and are classified as current in the consolidated balance sheets.

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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