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Note F - Debt Facilities (Details) (USD $)
 1 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended
Jun. 24, 2013
Jun. 30, 2013
Sep. 30, 2012
Jan. 31, 2014
Jan. 31, 2013
Apr. 30, 2013
Sep. 20, 2012
Mar. 09, 2012
Feb. 13, 2014
Subsequent Event [Member]
Jan. 31, 2014
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       2.41%   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 months 42 months
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%                      
Maximum Allowable Capital Expenditures By Credit Facilities Amendment                 10,000,000      
Debt Instrument, Basis Spread on Variable Rate                   2.25%    
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       29,000,000                
Debt Issuance Cost   200,000 42,000                  
Amortization of Financing Costs and Discounts       $ 163,000 $ 155,000