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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) | 6 Months Ended | 12 Months Ended |  | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended |  | 6 Months Ended
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Oct. 31, 2013 Property | Oct. 31, 2012 | Apr. 30, 2013 Property | Jul. 31, 2013 | Oct. 31, 2013 IRET [Member] | Oct. 31, 2013 Real Estate Development Company [Member] | Oct. 31, 2013 Acquired below-market leases and acquired above-market leases [Member] | Oct. 31, 2012 Acquired below-market leases and acquired above-market leases [Member] | Oct. 31, 2013 Acquired below-market leases and acquired above-market leases [Member] | Oct. 31, 2012 Acquired below-market leases and acquired above-market leases [Member] | Oct. 31, 2013 Other identified intangible assets [Member] | Oct. 31, 2012 Other identified intangible assets [Member] | Oct. 31, 2013 Other identified intangible assets [Member] | Oct. 31, 2012 Other identified intangible assets [Member] | Oct. 31, 2013 Dacotah Bank, Minot, North Dakota [Member] | Oct. 31, 2013 United Community Bank, Minot, North Dakota [Member] | Oct. 31, 2013 Commerce Bank, A Minnesota Banking Corporation [Member] | Oct. 31, 2013 First International Bank, Watford City, North Dakota [Member] | Oct. 31, 2013 Peoples State Bank of Velva, North Dakota [Member] | Oct. 31, 2013 Equity Bank, Minnetonka, Minnesota [Member] | Oct. 31, 2013 Associated Bank, Green Bay, Wisconsin [Member] | Oct. 31, 2013 American National Bank, Omaha, Nebraska [Member] | Oct. 31, 2013 United Community Bank and Equity Bank [Member] | Oct. 31, 2013 Anoka, Minnesota [Member] | Oct. 31, 2013 Bloomington, Minnesota [Member] | Oct. 31, 2013 Clive, Iowa [Member] | Oct. 31, 2013 St. Louis Park, Minnesota [Member]
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest in common units in operating partnership (in hundredths) | 82.90% |  | 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 | $ 1,860,000 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 265,000 | $ 329,000 | $ 402,000 | $ 864,000
Compensating Balances [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensating balances | 8,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 350,000 | 275,000 | 250,000 | 6,100,000 | 225,000 | 300,000 | 600,000 | 400,000 | 642,000 |  |  |  |
Decrease in lender holdbacks | 1,610,000 | 1,018,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in lender holdbacks | 562,000 | 1,687,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IDENTIFIED INTANGIBLE ASSETS AND INTANGIBLE LIABILITIES AND GOODWILL [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired | 892,000 | 813,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average lives of intangible assets and intangible liabilities | 7 months | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Gross, Total | 57,043,000 |  | 68,165,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization | (21,418,000) |  | (27,708,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Total | 35,625,000 |  | 40,457,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indentified intangible liabilities, gross | 203,000 |  | 391,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indentified intangible liabilities, accumulated amortization | (133,000) |  | (296,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indentified intangible liabilities, net | 70,000 |  | 95,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of Intangible Assets |  |  |  |  |  |  | (10,000) | (9,000) | (19,000) | (19,000) | 1,800,000 | 1,500,000 | 5,500,000 | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated annual amortization [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 |  |  |  |  |  |  | 19,000 |  | 19,000 |  | 4,987,000 |  | 4,987,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 |  |  |  |  |  |  | 16,000 |  | 16,000 |  | 4,601,000 |  | 4,601,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 |  |  |  |  |  |  | 8,000 |  | 8,000 |  | 4,133,000 |  | 4,133,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 |  |  |  |  |  |  | (5,000) |  | (5,000) |  | 3,701,000 |  | 3,701,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 |  |  |  |  |  |  | (5,000) |  | (5,000) |  | 3,549,000 |  | 3,549,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 1,100,000 |  | 1,106,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill derecognized | 7,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RECLASSIFICATIONS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of commercial industrial properties sold | 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of commercial office properties sold | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of commercial retail properties sold | 1 |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of commercial industrial held for sale | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of multi-family residential properties sold |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of commercial healthcare properties sold |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of condominium units sold |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVOLUNTARY CONVERSION OF ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of 32-unit buildings | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance proceeds received for business interruption from the flood and fire | 2,900,000 | 2,300,000 |  | 966,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance proceeds received for total business interruption proceeds | 409,000 |  |  | 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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership in VIE (in hundredths) |  |  |  |  | 51.00% | 49.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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