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Note 4 - Marketable Securities (Tables)
6 Months Ended
Sep. 23, 2012
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
   
Cost
   
Gross
Unrealized
Gains
   
Gross
Unrealized
Losses
   
Fair
Market
Value
 
September 23, 2012
  $ 11,837     $ 709     $ -     $ 12,546  
                                 
March 25, 2012
  $ 13,897     $ 814     $ 1     $ 14,710  
Investments Classified by Contractual Maturity Date [Table Text Block]
 
 
 
 
Total
   
Less than
1 Year
   
 
1 – 5 Years
   
 
5 – 10 Years
   
After
10 Years
 
Fair value of Municipal Bonds                              
                                         
September 23, 2012
  $ 12,546     $ 1,954     $ 9,329     $ 1,263     $ -