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REVENUES - Land sale revenues (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2021
Jan. 31, 2020
REVENUES        
Revenues $ 7,864 $ 5,287 $ 21,326 $ 14,014
Land sale revenues        
REVENUES        
Revenues 5,957 4,477 17,970 12,291
Land sale revenues | New Mexico        
REVENUES        
Revenues $ 5,957 3,812 $ 17,970 11,626
Land sale revenues | Corporate and Other [Member]        
REVENUES        
Revenues   $ 665   $ 665