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Note F - Debt Facilities (Details) (USD $)
 1 Months Ended 12 Months Ended 13 Months Ended 12 Months Ended
Feb. 28, 2014
Jun. 24, 2013
Sep. 30, 2012
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2012
Mar. 31, 2013
Nov. 30, 2011
Feb. 13, 2014
Sep. 20, 2012
Mar. 09, 2012
Apr. 30, 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       2.40% 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% [1]    
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       46,000,000                    
Debt Issuance Cost 207,000   42,000       306,000 530,000            
Amortization of Financing Costs and Discounts       $ 209,000 $ 209,000 $ 182,000                
[1] ( 2.40% at April 30, 2014 and 2.70% at April 30, 2013)