Note C - Finance Receivables (Details) - Financing receivables analysis	6 Months Ended
	Oct. 31, 2013	Oct. 31, 2012
Financing receivables analysis [Abstract]
Principal collected as a percent of average finance receivables	27.30%	29.40%
Average down-payment percentage	6.40%	6.80%
Average originating contract term (in months)	27 months 3 days	27 months
Portfolio weighted average contract term, including modifications (in months)	29 months 15 days	28 months 9 days