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Note F - Marketable Securities (Tables)
3 Months Ended
Jun. 28, 2015
Notes Tables  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
   
Cost
   
Gross
Unrealized
Gains
   
Gross
Unrealized
Losses
   
Fair
Market
Value
 
                                 
June 28, 2015
 
$
7,768
 
 
$
64
 
 
$
-
 
 
$
7,832
 
                                 
March 29, 2015
  $ 7,019     $ 72     $ -     $ 7,091  
Investments Classified by Contractual Maturity Date [Table Text Block]
Fair value of Municipal Bonds
 
Total
   
Less than
1 Year
   
1 – 5 Years
   
5 – 10 Years
   
After
10 Years
 
                                         
June 28, 2015
 
$
7,832
 
 
$
6,767
 
 
$
1,065
 
 
$
-
 
 
$
-