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Note C - Finance Receivables (Details) - Credit quality information for finance receivables (USD $)
Jul. 31, 2013
Apr. 30, 2013
Jul. 31, 2012
Credit quality information for finance receivables [Abstract]      
Current (in Dollars) $ 295,971,000 $ 284,441,000 $ 259,012,000
Current 77.91% 78.27% 78.50%
3 - 29 days past due (in Dollars) 63,260,000 60,477,000 57,575,000
3 - 29 days past due 16.65% 16.64% 17.45%
30 - 60 days past due (in Dollars) 14,326,000 10,232,000 9,968,000
30 - 60 days past due 3.77% 2.82% 3.02%
61 - 90 days past due (in Dollars) 4,680,000 6,280,000 2,742,000
61 - 90 days past due 1.23% 1.73% 0.83%
> 90 days past due (in Dollars) 1,683,000 1,964,000 638,000
> 90 days past due 0.44% 0.54% 0.20%
Total (in Dollars) $ 379,920,000 $ 363,394,000 $ 329,935,000
Total 100.00% 100.00% 100.00%