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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
In Thousands, except Share data
 3 Months Ended
Jul. 31, 2011
Jul. 31, 2010
Revenues:    
Sales $ 90,324 $ 82,602
Interest income 10,200 8,858
Total revenue 100,524 91,460
Costs and expenses:    
Cost of sales, excluding depreciation shown below 51,562 46,433
Selling, general and administrative 16,198 14,790
Provision for credit losses 18,534 16,138
Interest expense 442 967
Depreciation and amortization 538 456
Total costs and expenses 87,274 78,784
Income before taxes 13,250 12,676
Provision for income taxes 4,968 4,711
Net income 8,282 7,965
Less: Dividends on mandatorily redeemable preferred stock (10) (10)
Net income attributable to common stockholders $ 8,272 $ 7,955
Earnings per share:    
Basic (in Dollars per share) $ 0.81 $ 0.71
Diluted (in Dollars per share) $ 0.78 $ 0.70
Weighted average number of shares outstanding:    
Basic (in Shares) 10,271,359 11,223,777
Diluted (in Shares) 10,579,824 11,436,613