Note B - Summary of Significant Accounting Policies (Details) - Sales (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013
Revenue from External Customer [Line Items]
Sales	$ 108,400	$ 106,215	$ 325,314	$ 302,706
Sales - Used Autos [Member]
Revenue from External Customer [Line Items]
Sales	97,171	94,966	290,221	268,539
Wholesales - Third Party [Member]
Revenue from External Customer [Line Items]
Sales	3,855	4,300	13,078	13,953
Service Contract Sales [Member]
Revenue from External Customer [Line Items]
Sales	3,758	3,661	11,386	10,730
Payment Protection Plan Revenue [Member]
Revenue from External Customer [Line Items]
Sales	$ 3,616	$ 3,288	$ 10,629	$ 9,484