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Note B - Summary of Significant Accounting Policies (Detail) - Sales (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2012
Oct. 31, 2011
Sales $ 98,194 $ 100,128 $ 196,491 $ 190,452
Sales - Used Autos [Member]
       
Sales 86,688 88,702 173,573 168,276
Wholesales - Third Party [Member]
       
Sales 4,818 5,337 9,653 10,231
Service Contract Sales [Member]
       
Sales 3,546 3,347 7,069 6,539
Payment Protection Plan Revenue [Member]
       
Sales $ 3,142 $ 2,742 $ 6,196 $ 5,406