Note C - Finance Receivables (Details) - Credit Quality Information for Finance Receivables (USD $) In Thousands, unless otherwise specified	Jan. 31, 2014	Apr. 30, 2013	Jan. 31, 2013
Credit Quality Information for Finance Receivables [Abstract]
Current (in Dollars)	$ 321,511	$ 284,441	$ 287,553
Current	80.24%	78.27%	79.01%
3 - 29 days past due (in Dollars)	55,873	60,477	54,358
3 - 29 days past due	13.95%	16.64%	14.94%
30 - 60 days past due (in Dollars)	14,620	10,232	14,112
30 - 60 days past due	3.65%	2.82%	3.88%
61 - 90 days past due (in Dollars)	6,221	6,280	5,494
61 - 90 days past due	1.55%	1.73%	1.51%
> 90 days past due (in Dollars)	2,426	1,964	2,401
> 90 days past due	0.61%	0.54%	0.66%
Total (in Dollars)	$ 400,651	$ 363,394	$ 363,918
Total	100.00%	100.00%	100.00%