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Note F - Debt Facilities (Details) (USD $)
 1 Months Ended 3 Months Ended 3 Months Ended
Jun. 24, 2013
Jun. 30, 2013
Sep. 30, 2012
Jul. 31, 2013
Jul. 31, 2012
Apr. 30, 2013
Sep. 20, 2012
Mar. 09, 2012
Jul. 31, 2013
London Interbank Offered Rate (LIBOR) [Member]
Feb. 04, 2013
Minimum [Member]
Feb. 04, 2013
Maximum [Member]
Note F - Debt Facilities (Details) [Line Items]                      
Line of Credit Facility, Interest Rate at Period End       2.44%   2.70%          
Line of Credit Facility, Maximum Borrowing Capacity       $ 145,000,000     $ 145,000,000 $ 125,000,000      
Contract Term Of Contracts Included By Credit Facilities Amendment                   36 years 42 years
Line of Credit Facility, Expiration Date Jun. 30, 2016     Jun. 30, 2016              
Line of Credit Facility, Additional Borrowing Capacity 55,000,000                    
Decrease in Pricing Tiers, Percent 0.25%                    
Line of Credit Facility, Interest Rate Description       The Credit Facilities provide for three pricing tiers for determining the applicable interest rate, based on the Company's consolidated leverage ratio for the preceding fiscal quarter. The current applicable interest rate under the Credit Facilities is generally LIBOR plus 2.25%              
Debt Instrument, Basis Spread on Variable Rate                 2.25%    
Line of Credit Facility, Dividend Restrictions       The distribution limitations under the Credit Facilities 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 beginning March 9, 2012 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.              
Dividend Restrictions, Maximum Aggregate Amount of Stock Repurchases       40,000,000              
Dividend Restrictions, Percentage of Sum of Borrowing Bases       25.00%              
Dividend Restrictions, Percentage of Consolidated Net income       75.00%              
Dividend Restrictions, Minimum Percentage of Aggregate Funds Available       12.50%              
Line of Credit Facility, Remaining Borrowing Capacity       42,000,000              
Debt Issuance Cost   200,000 42,000                
Amortization of Financing Costs and Discounts       $ 73,000 $ 46,000