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Note C - Finance Receivables, Net (Details Textual) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
May 31, 2016
May 30, 2016
Jul. 31, 2019
Jan. 31, 2020
Jan. 31, 2019
Apr. 30, 2019
Finance Receivables, Weighted Average Interest Rate       16.40%    
Finance Receivables, Number of Loan Classes       1    
Finance Receivables, Number of Risk Pools       1    
Net Charge Offs as Percentage of Average Finance Receivables       17.50% 19.20%  
Collections as Percentage of Average Financing Receivables       40.00% 39.20%  
Delinquencies Greater Than 30 Days as Percentage of Average Financing Receivables       3.60% 3.20%  
Financing Receivable, Allowance for Credit Loss, Percentage     24.50%     25.00%
Financing Receivable, Allowance for Credit Loss, Recovery     $ 2.6      
Financing Receivable, Credit Loss, Expense (Reversal), Net of Tax, From Change in Allowance Percentage     $ (2.0)      
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       4 years