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Note B - Summary of Significant Accounting Policies (Details Textual) - USD ($)
 3 Months Ended 12 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Apr. 30, 2015
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | ARGENTINA      
Concentration Risk, Percentage 32.00%    
Minimum [Member]      
Financing Receivable Interest Rate 14.00%    
Allowance for Credit Losses, Primary Factor Units Repossessed or Charged Off Evaluation Period 1 year    
Maximum [Member]      
Financing Receivable Interest Rate 15.00%    
Allowance for Credit Losses, Primary Factor Units Repossessed or Charged Off Evaluation Period 5 years    
Payment Protection Plan [Member]      
Deferred Revenue $ 16,200,000    
Service Contract [Member]      
Deferred Revenue 10,100,000    
Goodwill, Impairment Loss 0   $ 0
Income Tax Examination, Penalties and Interest Accrued $ 0   0
Number of Reportable Segments 1    
Line of Credit Facility,Distribution Limitations Maximum Aggregate Amount of Stock Repurchases $ 40,000,000    
Line of Credit Facility, Distribution Limitations Percentage of Sum of Borrowing Bases 30.00%    
Line of Credit Facility, Distribution Limitations Percentage of Consolidated Net Income 75.00%    
Line of Credit Facility Distribution Limitations Minimum Percentage of Aggregate Funds Available 12.50%    
Interest Earned on Financing Receivables $ 1,800,000   2,000,000
Finance Receivables, Customer Payments Due Either Weekly or Bi-Weekly, Percentage 73.00%    
Financing Receivable, Greater Than or Equal to 30 Days Past Due, Percent of Portfolio 3.80% 4.70%  
Financing Receivable, Average Days Past Due At Charge Off 67 days    
Percentage of Receivable Charge-Offs 50.00%    
Average Age of Account at Charge-Off Date 342 days    
Financing Receivable, Allowance for Credit Losses, Write-downs $ 95,600,000    
Accounts Receivable, Allowance for Credit Losses, Percentage 23.80%    
Finance Receivable Principal Balance $ 427,881,000 $ 396,317,000 417,368,000
Deferred Revenue 26,290,000   25,236,000
Financing Receivable, Recorded Investmen Greater Than 90 Days Past Due 1,386,000 1,737,000 $ 2,795,000
Late Fee Income Generated by Servicing Financial Assets, Amount $ 526,000 $ 560,000  
Stock Repurchased During Period, Shares 46,000 74,683  
Stock Repurchased During Period, Value $ 2,300,000 $ 2,800,000