Note B - Summary of Significant Accounting Policies (Details Textual) - USD ($)				3 Months Ended		6 Months Ended	12 Months Ended	21 Months Ended	27 Months Ended
	Oct. 25, 2017	May 31, 2016	May 30, 2016	Jul. 31, 2019	Jul. 31, 2018	Oct. 24, 2017	Apr. 30, 2019	Jul. 31, 2019	Jul. 31, 2019	Apr. 30, 2018
Number of Reportable Segments				1
Average Finance Receivable Interest Rate				16.40%
Interest Receivable				$ 2,588,000			$ 2,348,000	$ 2,588,000	$ 2,588,000
Finance Receivables, Customer Payments Due Either Weekly or Bi-Weekly, Percentage				76.00%
Financing Receivable, Greater Than or Equal to 30 Days Past Due, Percent of Portfolio				3.80%	3.50%			3.80%	3.80%
Financing Receivable, Average Days Past Due At Charge Off				62 days
Financing Receivable, Weighted Average Total Contract Term				2 years 243 days
Financing Receivable, Remaining Contract Term				1 year 333 days
Financing Receivable, Allowance for Credit Loss, Ending Balance				$ 129,494,000	$ 122,447,000		127,842,000	$ 129,494,000	$ 129,494,000	$ 117,821,000
Finance Receivables, Allowance, Percent of Principle Balance				24.50%				24.50%	24.50%
Finance Receivable Principal Balance				$ 561,104,000	$ 520,820,000		543,328,000	$ 561,104,000	$ 561,104,000
Deferred Revenue, Total				$ 21,800,000				$ 21,800,000	$ 21,800,000
Percent of Chargeoffs in the First 10 to 11 Months of a Contract				50.00%				50.00%	50.00%
Average Age of Account at Charge-Off Date				1 year 15 days
Payment Protection Plan Liability, Anticipated Losses in Excess of Deferred Revenues				$ 0			0	$ 0	$ 0
Goodwill, Impairment Loss				$ 0			0
Effective Income Tax Rate Reconciliation, Percent, Total				21.80%	17.10%
Tax Adjustments, Settlements, and Unusual Provisions				$ (276,000)	$ (943,000)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent				21.00%
Income Tax Examination, Penalties and Interest Accrued, Total				$ 0			0	0	0
Financing Receivable, Recorded Investment Greater Than 90 Days Past Due				1,965,000	1,554,000		1,187,000	1,965,000	1,965,000
Late Fee Income Generated by Servicing Financial Assets, Amount				485,000	$ 446,000
Contract with Customer, Liability, Revenue Recognized				$ 5,300,000
Treasury Stock Shares to Establish Reserve Account to Secure Service Contracts				10,000
Liabilities, Total				$ 275,343,000			231,632,000	275,343,000	275,343,000
Assets, Total				548,779,000			$ 492,542,000	548,779,000	548,779,000
Accounting Standards Update 2016-02 [Member]
Liabilities, Total				34,500,000				34,500,000	34,500,000
Assets, Total				$ 34,500,000				34,500,000	34,500,000
ACM Insurance Company [Member]
Treasury Stock, Shares to Establish Reserve Account to Meet Regulatory Requirements for Insurance Company				14,000
Service Contract [Member]
Deferred Revenue, Total				$ 10,700,000				10,700,000	$ 10,700,000
Maximum [Member]
Financing Receivable Interest Rate		16.50%	15.00%	16.50%
Allowance for Credit Losses, Primary Factor Units Repossessed or Charged Off Evaluation Period				5 years
Minimum [Member]
Financing Receivable Interest Rate				15.00%
Allowance for Credit Losses, Primary Factor Units Repossessed or Charged Off Evaluation Period				1 year
Revolving Credit Facility [Member]
Line of Credit Facility, Distribution Limitations, Maximum Aggregate Amount of Stock Repurchases						$ 40,000,000		$ 50,000,000
Line of Credit Facility, Distribution Limitations Percentage of Sum of Borrowing Bases	20.00%			20.00%		25.00%			20.00%
Line of Credit Facility, Distribution Limitations Percentage of Consolidated Net Income				75.00%					75.00%
Line of Credit Facility Distribution Limitations Minimum Percentage of Aggregate Funds Available				12.50%					12.50%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Arkansas, USA [Member]
Concentration Risk, Percentage				28.00%