Note C - Finance Receivables (Detail) - Credit quality information for finance receivables (USD $)	Oct. 31, 2012	Apr. 30, 2012	Oct. 31, 2011
Current (in Dollars)	$ 270,853,000	$ 262,325,000	$ 258,768,000
Current	79.84%	82.77%	83.62%
3 - 29 days past due (in Dollars)	53,660,000	41,508,000	38,649,000
3 - 29 days past due	15.82%	13.10%	12.49%
30 - 60 days past due (in Dollars)	10,488,000	8,818,000	8,838,000
30 - 60 days past due	3.09%	2.78%	2.86%
61 - 90 days past due (in Dollars)	3,323,000	3,627,000	2,458,000
61 - 90 days past due	0.98%	1.14%	0.79%
> 90 days past due (in Dollars)	924,000	656,000	740,000
> 90 days past due	0.27%	0.21%	0.24%
Total (in Dollars)	$ 339,248,000	$ 316,934,000	$ 309,453,000
Total	100.00%	100.00%	100.00%