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Marketable Securities (Tables)
 3 Months Ended
May 31, 2014
Marketable Securities [Abstract]  
Amortized cost, gross unrealized gains and losses, and estimated fair values of investments available for sale
The amortized cost, gross unrealized gains and losses, and estimated fair values of investments available for sale at May 31, 2014 and March 1, 2014, were as follows: 
(In thousands)
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated
Fair
Value
May 31, 2014
 
 
 
 
 
 
 
Municipal bonds
$
10,913

 
$
119

 
$
(234
)
 
$
10,798

Total investments
$
10,913

 
$
119

 
$
(234
)
 
$
10,798

March 1, 2014
 
 
 
 
 
 
 
Municipal bonds
$
11,719

 
$
94

 
$
(336
)
 
$
11,477

Total investments
$
11,719

 
$
94

 
$
(336
)
 
$
11,477
Schedule of amortized cost and estimated fair values of investments by contractual maturity
The amortized cost and estimated fair values of investments at May 31, 2014, by contractual maturity, are shown below. Expected maturities may differ from contractual maturities as borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. 
(In thousands)
Amortized Cost
 
Estimated Market Value
Due within one year
$
560

 
$
564

Due after one year through five years
2,398

 
2,435

Due after five years through 10 years
6,690

 
6,703

Due after 10 years through 15 years
1,250

 
1,081

Due beyond 15 years
15

 
15

Total
$
10,913

 
$
10,798