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Note F - Debt Facilities (Details) (USD $)
 1 Months Ended 12 Months Ended 1 Months Ended
Sep. 30, 2012
Apr. 30, 2011
Nov. 30, 2010
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2011
Sep. 20, 2012
Mar. 09, 2012
Mar. 31, 2012
Amendment to Credit Facilities (Member)
Nov. 30, 2010
Refinancing Revolving Credit Facilities (Member)
Note F - Debt Facilities (Details) [Line Items]                    
Debt Instrument, Interest Rate, Stated Percentage       2.70% 2.74%          
Line of Credit Facility, Maximum Borrowing Capacity       $ 145,000,000     $ 145,000,000 $ 125,000,000    
Debt Instrument, Basis Spread on Variable Rate       2.50%            
Line of Credit Facility, Maximum Stock Repurchase Amount       40,000,000            
Percent of Borrowing Base       25.00%            
Line of Credit Facility, Percent of Consolidated Net Income       75.00%            
Line of Credit Facility, Percent of Aggregate Funds       12.50%            
Line of Credit Facility, Remaining Borrowing Capacity       40,000,000            
Debt Issuance Cost 42,000               306,000 530,000
Amortization of Financing Costs and Discounts       209,000 182,000 88,000        
Gains (Losses) on Extinguishment of Debt     (507,000)     (507,000)        
Derivative Asset, Notional Amount   20,000,000       20,000,000        
Derivative, Fixed Interest Rate   6.68%       6.68%        
Derivative, Variable Interest Rate   5.00%       5.00%        
Derivative, Gain on Derivative   1,300,000                
Unrealized Gain (Loss) on Derivatives           $ 72,000