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Marketable Securities (Tables)
 12 Months Ended
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.