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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Other Assets (Details) - USD ($)
$ in Thousands
Apr. 30, 2018
Apr. 30, 2017
Accounting Policies [Abstract]    
Receivable arising from straight line rents $ 1,458 $ 2,145
Accounts receivable 2,583 2,626
Fair value of interest rate swap 1,779 0
Loans receivable 15,480 0
Prepaid and other assets 2,832 2,741
Intangible assets 1,469 202
Property and equipment, net of accumulated depreciation 820 901
Goodwill 1,553 1,572
Deferred charges and leasing costs 2,323 3,119
Total Other Assets $ 30,297 $ 13,306