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Note C - Finance Receivables, Net (Details Textual)
 9 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Maximum [Member]    
Financing Receivable Interest Rate 15.00%  
Financing Receivable Payment Period 3 years 180 days  
Minimum [Member]    
Financing Receivable Payment Period 1 year 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 22.20% 19.90%
Collections as Percentage of Average Financing Receivables 40.60% 41.90%
Dellinquecies Greater than 30 Days as Percentage of Average Finance Receivables 5.00% 5.20%