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Note C - Finance Receivables, Net (Details Textual)
 3 Months Ended 12 Months Ended
Jul. 31, 2015
Apr. 30, 2015
Jul. 31, 2014
Minimum [Member]      
Financing Receivable Interest Rate 14.00%    
Financing Receivable Payment Period 1 year 180 days    
Maximum [Member]      
Financing Receivable Interest Rate 15.00%    
Financing Receivable Payment Period 3 years 180 days    
Installment Sale Contracts, Weighted Average Interest Rate 14.90%    
Finance Receivables, Number of Loan Classes 1    
Finance Receivables, Number of Risk Pools 1    
Net Charge Offs as Percentage of Average Finance Receivables 7.80% 6.30%  
Collections as Percentage of Average Financing Receivables 14.00% 14.10%  
Dellinquecies Greater than 30 Days as Percentage of Average Finance Receivables 3.80%   4.70%