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Note C - Finance Receivables, Net (Details) - Credit quality information for finance receivables (USD $)
Apr. 30, 2013
Apr. 30, 2012
Credit quality information for finance receivables [Abstract]    
Current (in Dollars) $ 284,441,000 $ 262,325,000
Current 78.27% 82.77%
3 - 29 days past due (in Dollars) 60,477,000 41,508,000
3 - 29 days past due 16.64% 13.10%
30 - 60 days past due (in Dollars) 10,232,000 8,818,000
30 - 60 days past due 2.82% 2.78%
61 - 90 days past due (in Dollars) 6,280,000 3,627,000
61 - 90 days past due 1.73% 1.14%
> 90 days past due (in Dollars) 1,964,000 656,000
> 90 days past due 0.54% 0.21%
Total (in Dollars) $ 363,394,000 $ 316,934,000
Total 100.00% 100.00%