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

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The charge against earnings of discontinued operations or disposal group in the period to reduce the carrying amount of real property to fair value.

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No definition available.

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

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No definition available.

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The entity's ownership interest in common units in the operating partnership.

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No definition available.

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- Definition

The number of impaired properties for the fiscal year.

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No definition available.

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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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No definition available.

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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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No definition available.

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

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No definition available.

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The remaining terms of certificates of deposit during the period.

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No definition available.

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A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

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The amount of a specific compensating balance arrangement that is maintained under an agreement for a bank loan or future credit availability.

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-Name Regulation S-X (SX)

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The charge against earnings in the period to reduce the carrying amount of real property to fair value.

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Amount classified as liabilities attributable to disposal group held for sale or disposed of.

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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	3 Months Ended	9 Months Ended
	Jan. 31, 2015	Jan. 31, 2015 Property Redemption	Jan. 31, 2014	Apr. 30, 2014
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Interest in operating partnership (in hundredths)	89.50%	89.50%		83.80%
Redemption basis		one-for-one
Redemptions by limited partner, maximum		2iret_RedemptionsByLimitedPartnerMaximum
Number of units to redeem, minimum (in units)	1,000iret_NumberOfUnitsToRedeemMinimum	1,000iret_NumberOfUnitsToRedeemMinimum
Period to hold the beneficial interest, minimum		1 year
Real Estate Properties [Line Items]
Impairment of retail property		$ 6,105,000us-gaap_ImpairmentOfRealEstate	$ 6,658,000us-gaap_ImpairmentOfRealEstate
Impairment of retail property attributable to discontinued operations		0	1,860,000
Number of impaired properties		6iret_NumberOfImpairedProperties
Held For Sale [Line Items]
Liabilities related to real estate held for sale	22,600,000	22,600,000
Compensating Balances [Line Items]
Compensating balances	14,300,000us-gaap_CompensatingBalanceAmount	14,300,000us-gaap_CompensatingBalanceAmount
Remaining terms of certificates of deposit	2 years
Decrease in lender holdbacks	11,063,000	11,063,000	2,186,000
Increase in lender holdbacks	621,000	913,000	12,388,000
Dacotah Bank, Minot, North Dakota [Member]
Compensating Balances [Line Items]
Compensating balances	350,000	350,000
Commerce Bank [Member]
Compensating Balances [Line Items]
Compensating balances	100,000	100,000
United Community Bank, Minot, North Dakota [Member]
Compensating Balances [Line Items]
Compensating balances	275,000	275,000
Bremer Bank [Member]
Compensating Balances [Line Items]
Compensating balances	1,300,000	1,300,000
First International Bank, Watford City, North Dakota [Member]
Compensating Balances [Line Items]
Compensating balances	6,100,000	6,100,000
Peoples State Bank of Velva, North Dakota [Member]
Compensating Balances [Line Items]
Compensating balances	225,000	225,000
Associated Bank, Green Bay, Wisconsin [Member]
Compensating Balances [Line Items]
Compensating balances	3,600,000	3,600,000
American National Bank, Omaha, Nebraska [Member]
Compensating Balances [Line Items]
Compensating balances	400,000	400,000
Private Bank [Member]
Compensating Balances [Line Items]
Compensating balances	2,000,000	2,000,000
United Community and Dacotah Bank [Member] \| Other Investments [Member]
Compensating Balances [Line Items]
Certificates of deposit	329,000	329,000
Anoka, Minnesota [Member]
Real Estate Properties [Line Items]
Impairment of retail property		265,000
Number of impaired properties		1
Minneapolis, Minnesota, office property [Member]
Real Estate Properties [Line Items]
Impairment of retail property		1,800,000
Number of impaired properties		1
Kalispell, Montana, retail property [Member]
Real Estate Properties [Line Items]
Impairment of retail property		2,100,000
Number of impaired properties		1
Golden Valley, Minnesota, office property [Member]
Real Estate Properties [Line Items]
Impairment of retail property		183,000
Number of impaired properties		1
Eagan, Minnesota, unimproved land [Member]
Real Estate Properties [Line Items]
Impairment of retail property		98,000
Number of impaired properties		1
Bloomington, Minnesota [Member]
Real Estate Properties [Line Items]
Impairment of retail property		329,000
Number of impaired properties		1
Boise, Idaho, office property [Member]
Real Estate Properties [Line Items]
Impairment of retail property		1,400,000
Number of impaired properties		1
Clive, Iowa [Member]
Real Estate Properties [Line Items]
Impairment of retail property		402,000
Number of impaired properties		1
Roseville, Minnesota, industrial property [Member]
Real Estate Properties [Line Items]
Impairment of retail property		4,800,000
Number of impaired properties		1
St. Louis Park, Minnesota [Member]
Real Estate Properties [Line Items]
Impairment of retail property		864,000
Number of impaired properties		1
Weston, Wisconsin, unimproved land [Member]
Real Estate Properties [Line Items]
Impairment of retail property		$ 442,000
Number of impaired properties		1