XML 51 R41.htm IDEA: XBRL DOCUMENT v3.6.0.2
Note F - Summary of Revolving Credit Facilities (Details) - USD ($)
6 Months Ended
Oct. 31, 2016
Apr. 30, 2016
Feb. 18, 2016
Feb. 17, 2016
Sep. 30, 2012
Mar. 09, 2012
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Interest rate 2.375%          
Revolving Credit Facility [Member]            
Aggregate amount $ 172,500   $ 172,500,000 $ 145,000,000 $ 145,000,000 $ 125,000,000
Maturity Oct. 08, 2017          
Revolving credit facilities and notes payable $ 124,488 $ 107,386        
Interest rate at period end 2.91% 2.81%        
Revolving credit facilities and notes payable $ 124,696,000 $ 107,902,000