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Note B - Summary of Significant Accounting Policies (Detail) - Sales (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Sales $ 98,297 $ 90,324
Sales - Used Autos [Member]
   
Sales 86,884 79,574
Wholesales - Third Party [Member]
   
Sales 4,835 4,894
Service Contract Sales [Member]
   
Sales 3,524 3,192
Payment Protection Plan Revenue [Member]
   
Sales $ 3,054 $ 2,664