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Note F - Debt Facilities (Details) (USD $)
 3 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended 3 Months Ended
Jul. 31, 2014
Jul. 31, 2013
Sep. 20, 2012
Credit Facilities, Amendment No. 1 [Member]
Revolving Credit Facility [Member]
Feb. 04, 2013
Credit Facilities, Amendment No. 2 [Member]
Revolving Credit Facility [Member]
Minimum [Member]
Feb. 04, 2013
Credit Facilities, Amendment No. 2 [Member]
Revolving Credit Facility [Member]
Maximum [Member]
Jun. 24, 2013
Credit Facilities, Amendment No. 3 [Member]
Revolving Credit Facility [Member]
Feb. 13, 2014
Credit Facilities, Amendment No. 4 [Member]
Revolving Credit Facility [Member]
Jul. 31, 2014
Revolving Credit Facility [Member]
London Interbank Offered Rate (LIBOR) [Member]
Jul. 31, 2014
Revolving Credit Facility [Member]
Apr. 30, 2014
Revolving Credit Facility [Member]
Mar. 09, 2012
Revolving Credit Facility [Member]
Note F - Debt Facilities (Details) [Line Items]                      
Line of Credit Facility, Interest Rate at Period End                 2.41% 2.40%  
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. 24, 2016     Jun. 24, 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%      
Line of Credit Facility, Distribution Limitations, Maximum Aggregate Amount of Stock Repurchases 40,000,000               40,000,000    
Line of Credit Facility, Distribution Limitations, Percentage of Sum of Borrowing Bases 25.00%               25.00%    
Line of Credit Facility, Distribution Limitations, Percentage of Consolidated Net income 75.00%               75.00%    
Line of Credit Facility, Distribution Limitations, Minimum Percentage of Aggregate Funds Available 12.50%               12.50%    
Line of Credit Facility, Remaining Borrowing Capacity                 48,000,000    
Amortization of Financing Costs and Discounts $ 46,000 $ 73,000