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INVESTMENT ASSETS: (Tables)
 12 Months Ended
Apr. 30, 2017
Investment Assets [Abstract]  
Schedule Of Investment Assets [Table Text Block]
 
 
April 30,
 
 
 
2017
 
2016
 
 
 
(in thousands)
 
 
 
 
 
 
 
Land held for long-term investment
 
$
9,715
 
$
9,717
 
Other
 
 
-
 
 
609
 
 
 
$
9,715
 
$
10,326