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OTHER LIABILITIES AND DEFERRED REVENUE; OTHER REVENUES (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2017
Jul. 31, 2017
Oct. 31, 2016
Oct. 31, 2017
Oct. 31, 2016
Apr. 30, 2017
Settlement gain   $ 1,318,000   $ 1,318,000 $ 0  
Sale of commercial building       0 1,496,000  
Deferred revenue and other $ 86,000   $ 78,000 174,000 242,000  
Other Revenue, Net $ 86,000   $ 78,000 $ 1,492,000 $ 1,738,000 $ 1,620,000