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Note F - Debt Facilities - Summary of Revolving Credit Facilities (Details) - USD ($)
12 Months Ended
Apr. 30, 2017
Dec. 12, 2016
Apr. 30, 2016
Feb. 18, 2016
Feb. 17, 2016
Sep. 30, 2012
Mar. 09, 2012
Revolving credit facilities and notes payable $ 117,944,000   $ 107,902,000        
Revolving Credit Facility [Member]              
Aggregate amount $ 200,000,000 $ 200,000,000   $ 172,500,000 $ 145,000,000 $ 145,000,000 $ 125,000,000
Maturity Dec. 12, 2019            
Revolving credit facilities and notes payable $ 118,124,000   $ 107,386,000        
Interest rate 3.37%   2.81%        
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Interest rate 2.375%