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The value of partnership units issued during the period.

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Transaction costs expensed during the period.

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Area of a real estate property.

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Date when the business acquisition agreement was executed, in CCYY-MM-DD format.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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Amount of facility held for productive use including, but not limited to, office, production, storage and distribution facilities, acquired at the acquisition date.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount of real estate acquired, at the acquisition date.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The number of units in a real estate property owned as of the balance sheet date.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

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ACQUISITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE AND DISPOSITIONS, ACQUISITIONS (Details)	3 Months Ended	6 Months Ended
	Oct. 31, 2016 USD ($)	Oct. 31, 2016 USD ($)	Oct. 31, 2015 USD ($) ft² item
Acquisitions and development projects placed in service [Abstract]
Partnership units issued			$ 400,000
Acquisitions Member
Business Acquisition [Line Items]
Transaction costs expensed during the period			153,000
Acquisitions and development projects placed in service [Abstract]
Total acquisition costs		$ 0	71,750,000
Form of consideration, cash			71,350,000
Form of consideration, units			400,000
Investment allocation, land			6,424,000
Investment allocation, building			64,144,000
Investment allocation, intangible assets			1,182,000
Results of operations from acquired properties [Abstract]
Total revenue			268,000
Net loss			(219,000)
Acquisitions Member \| Multi-Family Residential [Member]
Acquisitions and development projects placed in service [Abstract]
Total acquisition costs			65,250,000
Form of consideration, cash			64,850,000
Form of consideration, units			400,000
Investment allocation, land			5,521,000
Investment allocation, building			59,035,000
Investment allocation, intangible assets			$ 694,000
Acquisitions Member \| Multi-Family Residential [Member] \| 74 unit - Gardens - Grand Forks, ND [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired			Sep. 10, 2015
Total acquisition costs			$ 9,250,000
Form of consideration, cash			8,850,000
Form of consideration, units			400,000
Investment allocation, land			518,000
Investment allocation, building			8,672,000
Investment allocation, intangible assets			$ 60,000
Number of apartment units \| item			74
Acquisitions Member \| Multi-Family Residential [Member] \| 276 unit - GrandeVille at Cascade Lake - Rochester, MN [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired			Oct. 29, 2015
Total acquisition costs			$ 56,000,000
Form of consideration, cash			56,000,000
Investment allocation, land			5,003,000
Investment allocation, building			50,363,000
Investment allocation, intangible assets			$ 634,000
Number of apartment units \| item			276
Acquisitions Member \| Multi-Family Residential [Member] \| RED 20 - Minneapolis, MN [Member]
Acquisitions and development projects placed in service [Abstract]
Purchase price of minority interest in joint venture	$ 4,900,000
Interest in joint venture (in hundredths)	41.41%	41.41%
Acquisitions Member \| Healthcare [Member] \| 27,819 sq ft Lakeside Medical Plaza - Omaha, NE [Member]
Acquisitions and development projects placed in service [Abstract]
Date acquired			Aug. 20, 2015
Total acquisition costs			$ 6,500,000
Form of consideration, cash			6,500,000
Investment allocation, land			903,000
Investment allocation, building			5,109,000
Investment allocation, intangible assets			$ 488,000
Area of real estate property \| ft²			27,819