Note C - Finance Receivables, Net (Details Textual) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended		12 Months Ended
	May 31, 2016	May 30, 2016	Jul. 31, 2019	Jul. 31, 2018	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			5.40%	6.40%
Collections as Percentage of Average Financing Receivables			13.50%	13.10%
Delinquencies Greater Than 30 Days as Percentage of Average Financing Receivables			3.80%	3.50%
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)
Financing Receivable, Credit Loss, Expense (Reversal), per Diluted Share			$ 0.29
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