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Note C - Finance Receivables (Details) - Credit quality information for finance receivables (USD $)
Oct. 31, 2013
Apr. 30, 2013
Oct. 31, 2012
Credit quality information for finance receivables [Abstract]      
Current (in Dollars) $ 313,006,000 $ 284,441,000 $ 270,853,000
Current 80.50% 78.27% 79.84%
3 - 29 days past due (in Dollars) 57,429,000 60,477,000 53,660,000
3 - 29 days past due 14.77% 16.64% 15.82%
30 - 60 days past due (in Dollars) 12,008,000 10,232,000 10,488,000
30 - 60 days past due 3.09% 2.82% 3.09%
61 - 90 days past due (in Dollars) 4,429,000 6,280,000 3,323,000
61 - 90 days past due 1.14% 1.73% 0.98%
> 90 days past due (in Dollars) 1,927,000 1,964,000 924,000
> 90 days past due 0.50% 0.54% 0.27%
Total (in Dollars) $ 388,799,000 $ 363,394,000 $ 339,248,000
Total 100.00% 100.00% 100.00%