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Note F - Debt Facilities (Details Textual) - USD ($)
9 Months Ended 12 Months Ended
Dec. 15, 2015
Oct. 08, 2014
Jun. 24, 2013
Feb. 04, 2013
Jan. 31, 2016
Apr. 30, 2016
Apr. 30, 2015
Apr. 30, 2014
Feb. 18, 2016
Feb. 17, 2016
Feb. 13, 2014
Sep. 30, 2012
Mar. 09, 2012
Revolving Credit Facility [Member] | Credit Facilities Amendment Number 5 [Member]                          
Line of Credit Facility, Expiration Date   Oct. 08, 2017                      
Line of Credit Facility Increase in Pricing Tiers Percent   0.125%                      
Dividend Restrictions Maximum Aggregate Amount of Stock Repurchases   $ 40,000,000                      
Dividend Restrictions Percentage of Sum of Borrowing Bases   30.00%                      
Revolving Credit Facility [Member] | Credit Facilities, Amendment Number 3 [Member]                          
Line of Credit Facility, Additional Borrowing Capacity, Accordion Feature     $ 55,000,000                    
Line of Credit Facility, Decrease in Pricing Tiers, Percent     0.25%                    
Revolving Credit Facility [Member] | Credit Facilities, Amendment Number 4 [Member]                          
Maximum Allowable Capital Expenditures By Credit Facilities Amendment                     $ 10,000,000    
Revolving Credit Facility [Member] | Minimum [Member]                          
Contract Term of Contracts Included by Credit Facilities Amendment       3 years                  
Revolving Credit Facility [Member] | Maximum [Member]                          
Contract Term of Contracts Included by Credit Facilities Amendment       3 years 180 days                  
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                          
Debt Instrument, Basis Spread on Variable Rate         2.375% 2.375%              
Revolving Credit Facility [Member]                          
Line of Credit Facility, Maximum Borrowing Capacity           $ 172,500,000     $ 172,500,000 $ 145,000,000   $ 145,000,000 $ 125,000,000
Line of Credit Facility, Expiration Date     Jun. 24, 2016     Oct. 08, 2017              
Dividend Restrictions Maximum Aggregate Amount of Stock Repurchases           $ 40,000,000              
Line of Credit Facility, Total Increase in Borrowing Capacity                 27,500,000        
Line of Credit Facility, Additional Borrowing Capacity, Accordion Feature                 55,000,000        
Line of Credit Facility, Maximum Borrowing Capacity, Accordion Feature                 $ 200,000,000        
Line of Credit Facility, Distribution Limitations Percentage of Sum of Borrowing Bases           30.00%              
Line of Credit Facility, Distribution Limitations Percentage of Consolidated Net Income           75.00%              
Line of Credit Facility Distribution Limitations Minimum Percentage of Aggregate Funds Available           12.50%              
Line of Credit Facility, Remaining Borrowing Capacity           $ 61,000,000              
Note Payable Related to the Property Purchase Agreement [Member]                          
Debt Instrument, Face Amount $ 550,000                        
Debt Instrument, Periodic Payment $ 10,005                        
Debt Instrument, Interest Rate, Stated Percentage 3.50%                        
Long-term Debt           $ 516,000              
Line of Credit Facility, Distribution Limitations Percentage of Sum of Borrowing Bases           30.00%              
Line of Credit Facility, Distribution Limitations Percentage of Consolidated Net Income           75.00%              
Line of Credit Facility Distribution Limitations Minimum Percentage of Aggregate Funds Available           12.50%              
Amortization of Debt Issuance Costs and Discounts           $ 214,000 $ 188,000 $ 209,000          
Debt Issuance Costs, Gross           $ 396,000 $ 464,000