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Note B - Summary of Significant Accounting Policies (Details Textual) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 31, 2016 | Oct. 31, 2015 | Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
Financing Receivable, Allowance for Credit Losses, Write-downs |  | $ 4,800,000 |  |  |
Payment Protection Plan Liability, Anticipated Losses in Excess of Deferred Revenues |  |  | $ 0 | $ 0 |
Goodwill, Impairment Loss |  |  | 0 | 0 |
Income Tax Examination, Penalties and Interest Accrued |  |  | 0 | 0 |
Financing Receivable, Recorded Investment Greater Than 90 Days Past Due |  |  | 1,470,000 | 1,089,000 |
Late Fee Income Generated by Servicing Financial Assets, Amount |  |  | 2,000,000 | 2,000,000 | $ 2,200,000
Advertising Expense |  |  | $ 4,000,000 | 4,200,000 | 3,600,000
Defined Contribution Plan, Employer Matching Contribution, Percent of Match |  |  | 50.00% |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay |  |  | 4.00% |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount |  |  | $ 437,000 | $ 403,000 | $ 363,000
Stock Repurchased During Period, Shares |  |  | 666,202 | 493,073 | 442,700
Stock Repurchased During Period, Value |  |  | $ 20,500,000 | $ 14,200,000 | $ 20,000,000
Treasury Stock, Shares to Establish Reserve Account to Secure Service Contracts |  |  |  | 10,000 |
Treasury Stock, Shares to Establish Reserve Account for Subsidiaries |  |  | 10,000 |  |
Number of Reportable Segments |  |  | 1 |  |
Line of Credit Facility,Distribution Limitations Maximum Aggregate Amount of Stock Repurchases |  |  | $ 40,000,000 |  |
Line of Credit Facility, Distribution Limitations Percentage of Sum of Borrowing Bases |  |  | 25.00% |  |
Line of Credit Facility, Distribution Limitations Percentage of Consolidated Net Income |  |  | 75.00% |  |
Line of Credit Facility Distribution Limitations Minimum Percentage of Aggregate Funds Available |  |  | 12.50% |  |
Financing Receivable Interest Rate |  |  | 15.90% |  |
Interest Earned on Financing Receivables |  |  | $ 2,100,000 | $ 1,700,000 |
Finance Receivables, Customer Payments Due Either Weekly or Bi-Weekly, Percentage |  |  | 74.00% |  |
Financing Receivable, Greater Than or Equal to 30 Days Past Due, Percent of Portfolio |  |  | 3.60% | 3.00% |
Financing Receivable, Average Days Past Due At Charge Off |  |  | 60 days |  |
Percentage of Receivable Charge-Offs |  |  | 50.00% |  |
Average Age of Account at Charge-Off Date |  |  | 357 days |  |
Finance Receivables, Allowance, Percent of Principle Balance |  |  | 25.00% |  |
2006 Employee Stock Purchase Plan [Member] |  |  |  |  |
Common Stock Discount on Shares Percentage |  |  | 15.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  | 200,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  | 147,886 |  |
Maximum [Member] |  |  |  |  |
Financing Receivable Interest Rate | 16.50% |  | 16.50% | 15.00% |
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 |  |
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Arkansas, USA [Member] |  |  |  |  |
Concentration Risk, Percentage |  |  | 30.00% |  |

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