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Note C - Finance Receivables, Net (Details Textual)
 3 Months Ended
May 31, 2016
May 30, 2016
Jul. 31, 2018
Jul. 31, 2017
Financing Receivable Interest Rate     16.30%  
Finance Receivables, Weighted Average Interest Rate     16.30%  
Finance Receivables, Number of Loan Classes     1  
Finance Receivables, Number of Risk Pools     1  
Net Charge Offs as Percentage of Average Finance Receivables     6.40% 6.40%
Collections as Percentage of Average Financing Receivables     13.10% 12.40%
Delinquencies Greater Than 30 Days as Percentage of Average Financing Receivables     3.50% 4.60%
Minimum [Member]        
Financing Receivable Interest Rate     15.00%  
Financing Receivable Payment Period     1 year 180 days  
Maximum [Member]        
Financing Receivable Interest Rate 16.50% 15.00% 16.50%  
Financing Receivable Payment Period     3 years 180 days