Note C - Finance Receivables (Details) - Credit Quality Information for Finance Receivables (USD $) In Thousands, unless otherwise specified	Jul. 31, 2014	Apr. 30, 2014	Jul. 31, 2013
Credit Quality Information for Finance Receivables [Abstract]
Current	$ 314,969	$ 300,478	$ 295,971
Current	79.48%	79.21%	77.91%
3 - 29 days past due	62,700	62,108	63,260
3 - 29 days past due	15.82%	16.38%	16.65%
30 - 60 days past due	12,853	10,926	14,326
30 - 60 days past due	3.24%	2.88%	3.77%
61 - 90 days past due	4,058	4,665	4,680
61 - 90 days past due	1.02%	1.23%	1.23%
> 90 days past due	1,737	1,155	1,683
> 90 days past due	0.44%	0.30%	0.44%
Total	$ 396,317	$ 379,332	$ 379,920
Total	100.00%	100.00%	100.00%