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The cash inflow associated with the decrease in lender hold backs for improvements.

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Impairment of real estate continuing and discontinued operations.

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The cash outflow associated with the increase in lender hold backs for improvements.

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The entity's ownership interest in the operating partnership.

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The number of impaired properties for the fiscal year.

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Number of real estate properties classified as held for sale.

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The minimum number of units required for a limited partner to exercise the redemption, unless such limited partner holds less than this minimum, in which case the minimum number of units is equal to the number of units held by such limited partner.

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The percentage of ordinary taxable income that the entity is required to distribute to shareholders.

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The minimum period for which some limited partners have contractually agreed to hold the beneficial interest.

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The number of limited partners' units to be redeemed in exchange for a number of common shares upon exercise of the redemption option by the limited partners.

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The maximum number of redemptions by a limited partner that may occur in a calendar year.

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Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(d))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Real Estate Properties (Details)	3 Months Ended		12 Months Ended
	Jul. 31, 2017 USD ($) item property shares	Jul. 31, 2016 USD ($) property	Apr. 30, 2017 USD ($) property
BASIS OF PRESENTATION [Abstract]
Interest in operating partnership (in hundredths)	89.20%		88.60%
Redemption basis	one-for-one
Redemptions by limited partner, maximum \| item	2
Number of units to redeem, minimum (in units) \| shares	1,000
Period to hold the beneficial interest, minimum	1 year
INCOME TAXES
Percentage of ordinary taxable income that must be distributed to shareholders (in hundredths)	90.00%
RECENT ACCOUNTING PRONOUNCEMENTS
Property owned	$ 1,744,252,000		$ 1,677,481,000
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract]
Impairment of real estate investments	256,000	$ 54,153,000
LENDER HOLDBACKS
Decrease in lender holdbacks for improvements	652,000	735,000
Increase in lender holdbacks for improvements	257,000	346,000
191 unit - Oxbo - St. Paul, MN [Member] \| Acquisitions Member
RECENT ACCOUNTING PRONOUNCEMENTS
Property owned	$ 125,000
Unimproved Land [Member] \| Williston, ND - property [Member]
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract]
Impairment of real estate investments		$ 2,800,000
Number of impaired properties \| property		1
Multi-Family Residential [Member] \| Williston, ND - property [Member]
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract]
Number of impaired properties \| property		3
Multi-Family Residential [Member] \| Williston, ND - property 1 [Member]
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract]
Impairment of real estate investments		$ 40,900,000
Multi-Family Residential [Member] \| Williston, ND - property 2 [Member]
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract]
Impairment of real estate investments		5,800,000
Multi-Family Residential [Member] \| Williston, ND - property 3 [Member]
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract]
Impairment of real estate investments		$ 4,700,000
Assets Held for Sale [Member] \| Medical Property [Member]
Held for Sale [Abstract]
Number of real estate properties classified as held for sale \| property	2		2
Assets Held for Sale [Member] \| Unimproved Land [Member]
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract]
Impairment of real estate investments	$ 256,000
Held for Sale [Abstract]
Number of real estate properties classified as held for sale \| property	1
Assets Held for Sale [Member] \| Multi-Family Residential [Member]
Held for Sale [Abstract]
Number of real estate properties classified as held for sale \| property	13		13
Assets Held for Sale [Member] \| Commercial Properties [Member]
Held for Sale [Abstract]
Number of real estate properties classified as held for sale \| property	1		2