Note C - Finance Receivables (Details) - Financing Receivables Analysis	3 Months Ended
	Jul. 31, 2014	Jul. 31, 2013
Financing Receivables Analysis [Abstract]
Principal collected as a percent of average finance receivables	14.10%	13.80%
Average down-payment percentage	6.90%	6.60%
Average originating contract term (in months)	27 years 73 days	27 years 255 days