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Marketable Securities
 9 Months Ended
Jan. 28, 2012
Marketable Securities [Abstract]  
Marketable Securities
Note 10.  Marketable Securities

We have a cash management program which provides for the investment of cash balances not used in current operations.  We classify our investments in marketable securities as available-for-sale in accordance with the provisions of ASU 320, Investments - Debt and Equity Securities.  Marketable securities classified as available-for-sale are reported at fair value with unrealized gains or losses, net of tax, reported in other comprehensive income.  Unrealized losses considered to be "other-than-temporary" are recognized currently in earnings.  The cost of securities sold is based on the specific identification method.  Where quoted market prices are not available, we use the market price of similar types of securities that are traded in the market to estimate fair value.  As of January 28, 2012 and April 30, 2011, our available-for-sale securities consisted of the following:

Amortized Cost
  
Gross Unrealized Gains
  
Gross Unrealized Losses
  
Fair Value
 
Balance as of January 28, 2012
           
Certificates of deposit
$5,433  $-  $-  $5,433 
U.S. Treasury bills
 -   -   -   - 
U.S. Government sponsored entities
 11,021   67   -   11,088 
Municipal bonds
 3,371   24   -   3,395 
Total
$19,825  $91  $-  $19,916 
                 
Balance as of April 30, 2011
               
Certificates of deposit
$4,913  $-  $-  $4,913 
U.S. Treasury bills
 1,998   1   -   1,999 
U.S. Government sponsored entities
 13,598   19   -   13,617 
Municipal bonds
 2,412   2   -   2,414 
Total
$22,921  $22  $-  $22,943 
                 

All available-for-sale securities are classified as current assets, as they are readily available to support our current operating needs. The contractual maturities of available-for-sale debt securities as of January 28, 2012 were as follows:

 
Less than 12 months
 
Greater than 12 months
 
Total
 
Certificates of deposit
$3,951 $1,482 $5,433 
U.S. Treasury bills
 -  -  - 
U.S. Government sponsored agencies
 5,037  6,051  11,088 
Municipal obligations
 768  2,627  3,395 
   Total available-for-sale
$9,756 $10,160 $19,916