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Note B - Summary of Significant Accounting Policies - Sales (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Sales $ 246,742 $ 162,799
Sales Used Autos [Member]    
Sales 216,590 141,634
Wholesales Third Party [Member]    
Sales 12,295 6,949
Service Contract Sales [Member]    
Sales 10,161 7,874
Payment Protection Plan Revenue [Member]    
Sales $ 7,696 $ 6,342