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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Jul. 31, 2013 | Jul. 31, 2012 | Apr. 30, 2013
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES [Abstract] |  |  |
Interest in common units in operating partnership (in hundredths) | 82.70% |  | 82.40%
Redemption basis | one-for-one |  |
Redemptions by limited partner, maximum | 2 |  |
Number of units to redeem, minimum (in units) | 1,000 |  |
Real Estate Properties [Line Items] |  |  |
Impairment of retail property | $ 1,803,000 | $ 0 |
Compensating Balances [Line Items] |  |  |
Compensating balances | 8,400,000 |  |
Decrease in lender holdbacks | 1,144,000 | 624,000 |
Increase in lender holdbacks | 279,000 | 1,403,000 |
IDENTIFIED INTANGIBLE ASSETS AND INTANGIBLE LIABILITIES AND GOODWILL [Abstract] |  |  |
Finite-lived Intangible Assets Acquired | 362,000 | 752,000 |
Weighted average lives of intangible assets and intangible liabilities | 6 months | 6 months |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross, Total | 61,008,000 |  | 68,165,000
Finite-Lived Intangible Assets, Accumulated Amortization | (24,019,000) |  | (27,708,000)
Finite-Lived Intangible Assets, Net, Total | 36,989,000 |  | 40,457,000
Indentified intangible liabilities, gross | 327,000 |  | 391,000
Indentified intangible liabilities, accumulated amortization | (249,000) |  | (296,000)
Indentified intangible liabilities, net | 78,000 |  | 95,000
Estimated annual amortization [Abstract] |  |  |
Goodwill | 1,100,000 |  | 1,106,000
Goodwill derecognized | 7,000 |  |
INVOLUNTARY CONVERSION OF ASSETS [Abstract] |  |  |
Number of 32-unit buildings | 2 |  |
Insurance proceeds received for business interruption from the flood and fire | 966,000 |  |
Insurance proceeds received for total business interruption proceeds | 966,000 |  |
PROCEEDS FROM FINANCING LIABILITY [Abstract] |  |  |
Proceeds from sale of non-core assisted living property | 7,900,000 |  |
Amount of deed contract | 29,000,000 |  |
Variable Interest Entity [Line Items] |  |  |
Estimated total costs of joint venture project | 52,200,000 |  |
Percentage of project financed with third-party debt in joint venture (in hundredths) | 69.00% |  |
Percentage of project financed with IRET in joint venture (in hudnredths) | 7.00% |  |
IRET [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Percentage of ownership in VIE (in hundredths) | 51.00% |  |
Real Estate Development Company [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Percentage of ownership in VIE (in hundredths) | 49.00% |  |
Acquired below-market leases and acquired above-market leases [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of Intangible Assets | (10,000) | (10,000) |
Estimated annual amortization [Abstract] |  |  |
2015 | 21,000 |  |
2016 | 17,000 |  |
2017 | 9,000 |  |
2018 | (5,000) |  |
2019 | (5,000) |  |
Other identified intangible assets [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of Intangible Assets | 3,600,000 | 1,500,000 |
Estimated annual amortization [Abstract] |  |  |
2015 | 4,830,000 |  |
2016 | 4,612,000 |  |
2017 | 4,143,000 |  |
2018 | 3,701,000 |  |
2019 | 3,549,000 |  |
Dacotah Bank, Minot, North Dakota [Member] |  |  |
Compensating Balances [Line Items] |  |  |
Compensating balances | 350,000 |  |
United Community Bank, Minot, North Dakota [Member] |  |  |
Compensating Balances [Line Items] |  |  |
Compensating balances | 275,000 |  |
Commerce Bank, A Minnesota Banking Corporation [Member] |  |  |
Compensating Balances [Line Items] |  |  |
Compensating balances | 250,000 |  |
First International Bank, Watford City, North Dakota [Member] |  |  |
Compensating Balances [Line Items] |  |  |
Compensating balances | 6,100,000 |  |
Peoples State Bank of Velva, North Dakota [Member] |  |  |
Compensating Balances [Line Items] |  |  |
Compensating balances | 225,000 |  |
Equity Bank, Minnetonka, Minnesota [Member] |  |  |
Compensating Balances [Line Items] |  |  |
Compensating balances | 300,000 |  |
Associated Bank, Green Bay, Wisconsin [Member] |  |  |
Compensating Balances [Line Items] |  |  |
Compensating balances | 500,000 |  |
American National Bank, Omaha, Nebraska [Member] |  |  |
Compensating Balances [Line Items] |  |  |
Compensating balances | 400,000 |  |
United Community Bank and Equity Bank [Member] |  |  |
Compensating Balances [Line Items] |  |  |
Compensating balances | 640,000 |  |
Anoka, Minnesota [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Impairment of retail property | 265,000 |  |
Bloomington, Minnesota [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Impairment of retail property | 329,000 |  |
Clive, Iowa [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Impairment of retail property | 345,000 |  |
St. Louis Park, Minnesota [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Impairment of retail property | $ 864,000 |  |

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- Definition The gross proceeds received from the asset(s) sold in connection with the transaction involving the sale of property to another party and the lease back to the seller. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=9155692&loc=d3e51843-112757 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=9155692&loc=d3e51831-112757 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 51 -URI http://asc.fasb.org/extlink&oid=9155692&loc=d3e51840-112757 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 98 -Section Appendix A -Paragraph 28, 29 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7880789&loc=SL6759159-111685 + Details
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