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Note F - Debt Facilities - Summary of Revolving Credit Facilities (Details) - USD ($)
9 Months Ended
Jan. 31, 2018
Apr. 30, 2017
Dec. 12, 2016
Feb. 18, 2016
Revolving credit facilities and notes payable $ 148,172,000 $ 117,944,000    
Revolving Credit Facility [Member]        
Aggregate Amount $ 200,000,000   $ 200,000,000 $ 172,500,000
Maturity Dec. 12, 2019      
Revolving credit facilities and notes payable   $ 118,124,000    
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Interest Rate 2.35%      
Revolving credit facilities and notes payable $ 147,191,000