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Note B - Summary of Significant Accounting Policies (Details) (USD $)
 12 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2011
Note B - Summary of Significant Accounting Policies (Details) [Line Items]      
Number of Reportable Segments 1    
Concentration Risk, Percentage 39.00%    
Finance Receivables Interest Rate Range Start 11.00%    
Finance Receivable Interest Rate Range End 19.00%    
Interest Earned On Financing Receivables (in Dollars) $ 1,800,000 $ 1,400,000  
Finance Receivables, Customer Payments Due Either Weekly or Bi-Weekly, Percentage 75.00%    
Financing Receivable, Greater Than Or Equal To 30 Days Past Due, Percent Of Portfolio 5.10% 4.10%  
Financing Receivable, Allowance for Credit Losses, Policy for Uncollectible Amounts [Policy Text Block]
The calculation of the allowance for credit losses uses the following primary factors:

·  
The number of units repossessed or charged-off as a percentage of total units financed over specific historical periods of time.

·  
The average net repossession and charge-off loss per unit during the last eighteen months, segregated by the number of months since the contract origination date, and adjusted for the expected future average net charge-off loss per unit.  Approximately 50% of the charge-offs that will ultimately occur in the portfolio are expected to occur within 10-11 months following the balance sheet date.  The average age of an account at charge-off date is 10.6 months.

·  
The timing of repossession and charge-off losses relative to the date of sale (i.e., how long it takes for a repossession or charge-off to occur) for repossessions and charge-offs occurring during the last eighteen months.

A point estimate is produced by this analysis which is then supplemented by any positive or negative subjective factors to arrive at an overall reserve amount that management considers to be a reasonable estimate of losses inherent in the portfolio at the balance sheet date that will be realized via actual charge-offs in the future. Although it is at least reasonably possible that events or circumstances could occur in the future that are not presently foreseen which could cause actual credit losses to be materially different from the recorded allowance for credit losses, the Company believes that it has given appropriate consideration to all relevant factors and has made reasonable assumptions in determining the allowance for credit losses.  Periods of economic downturn do not necessarily lead to increased credit losses because the Company provides basic affordable transportation to customers that, for the most part, do not have access to public transportation.  The effectiveness of the execution of internal policies and procedures within the collections area has historically had a more significant effect on collection results than macro-economic issues.

In most states, the Company offers retail customers who finance their vehicle the option of purchasing a payment protection plan product as an add-on to the installment sale contract.  This product contractually obligates the Company to cancel the remaining principal outstanding for any contract where the retail customer has totaled the vehicle, as defined, or the vehicle has been stolen.  The Company periodically evaluates anticipated losses to ensure that if anticipated losses exceed deferred payment protection plan revenues, an additional liability is recorded for such difference.
    
Percent of Charge-Offs 50.00%    
Average Age of Account At Charge-Off Date 10 months 18 days    
Financing Receivable Recorded Investment Greater Than 90 Days Past Due (in Dollars) 1,964,000 656,000  
Late Fee Income Generated by Servicing Financial Assets, Amount (in Dollars) 2,000,000 1,700,000 1,700,000
Advertising Expense (in Dollars) 4,100,000 3,500,000 3,400,000
Defined Contribution Plan, Employer Match Percentage 50.00%    
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 4.00%    
Defined Contribution Plan, Employer Discretionary Contribution Amount (in Dollars) 290,000 236,000 201,000
Common Stock, Discount on Shares (in Dollars) 0.15    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) 200,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) 167,537    
Stock Repurchased During Period, Shares (in Shares) 398,548 1,212,791 848,900
Stock Repurchased During Period, Value (in Dollars) $ 17,300,000 $ 39,400,000 $ 20,300,000
Summary Of Significant Accounting Policies Note [Member]
      
Note B - Summary of Significant Accounting Policies (Details) [Line Items]      
Line of Credit Facility, Dividend Restrictions Restrictions on Distributions/Dividends The Company's revolving credit facilities generally limit distributions by the Company to its shareholders in order to repurchase the Company's common stock.The distribution limitations under the Agreement allow the Company to repurchase the Company's stock so long as: either (a) the aggregate amount of such repurchases does not exceed $40 million and the sum of borrowing bases combined minus the principal balances of all revolver loans after giving effect to such repurchases is equal to or greater than 25% of the sum of the borrowing bases, or (b) the aggregate amount of such repurchases does not exceed 75% of the consolidated net income of the Company measured on a trailing twelve month basis; provided that immediately before and after giving effect to the stock repurchases, at least 12.5% of the aggregate funds committed under the credit facilities remain available. Thus, the Company is limited in the amount of dividends or other distributions it can make to its shareholders without the consent of the Company's lenders.    
Furniture, fixtures, and equipment [Member] | Minimum [Member]
      
Note B - Summary of Significant Accounting Policies (Details) [Line Items]      
Property, Plant and Equipment, Useful Life 3 years    
Furniture, fixtures, and equipment [Member] | Maximum [Member]
      
Note B - Summary of Significant Accounting Policies (Details) [Line Items]      
Property, Plant and Equipment, Useful Life 7 years    
Leasehold Improvements [Member] | Minimum [Member]
      
Note B - Summary of Significant Accounting Policies (Details) [Line Items]      
Property, Plant and Equipment, Useful Life 5 years    
Leasehold Improvements [Member] | Maximum [Member]
      
Note B - Summary of Significant Accounting Policies (Details) [Line Items]      
Property, Plant and Equipment, Useful Life 15 years    
Building and Building Improvements [Member] | Minimum [Member]
      
Note B - Summary of Significant Accounting Policies (Details) [Line Items]      
Property, Plant and Equipment, Useful Life 18 years    
Building and Building Improvements [Member] | Maximum [Member]
      
Note B - Summary of Significant Accounting Policies (Details) [Line Items]      
Property, Plant and Equipment, Useful Life 39 years