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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2013 USD ($) | Apr. 30, 2016 USD ($) $ / shares Property Segment | Apr. 30, 2015 USD ($) Property Unit Redemption Partners Segment shares | Apr. 30, 2014 USD ($) Property State | Apr. 30, 2013 USD ($) Property Unit
BASIS OF PRESENTATION [Abstract] |  |  |  |  |
Interest in operating partnership (in hundredths) |  |  | 89.90% | 83.80% |
Percentage of general interest partnership (in hundredths) |  |  | 100.00% |  |
Redemption basis |  |  | 1:1 |  |
Redemptions by limited partner, maximum | Redemption |  |  | 2 |  |
Number of units to redeem, minimum (in units) | shares |  |  | 1,000 |  |
Period to hold the beneficial interest, minimum |  |  | 1 year |  |
RECLASSIFICATIONS |  |  |  |  |
Number of reportable segments | Segment |  |  | 5 |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Number of year after date of acquisition related to adjustment of real estate preliminary allocations of purchase price |  |  | 1 year |  |
Impairment of retail property |  |  | $ 6,105,000 | $ 44,426,000 | $ 305,000
Impairment of real estate investments |  |  | $ 4,663,000 | $ 7,700,000 |
Number of impaired properties | Property |  |  | 6 | 15 | 1
Liabilities held for sale |  |  | $ 138,800,000 |  |
IDENTIFIED INTANGIBLE ASSETS AND LIABILITIES AND GOODWILL [Abstract] |  |  |  |  |
New intangible assets |  |  | 416,000 | $ 900,000 |
Addition to intangible liabilities |  |  | $ 0 | $ 0 |
Weighted average lives of intangible assets acquired |  |  | 6 months | 8 months 12 days |
Goodwill book value |  |  | $ 1,718,000 | $ 1,100,000 |
Recognized impairment goodwill |  |  | 0 | 0 |
Goodwill recognized |  |  | 852,000 |  |
Goodwill derecognized |  |  | 40,000 | 7,000 | $ 14,000
PROPERTY AND EQUIPMENT [Abstract] |  |  |  |  |
Property and equipment cost |  |  | 3,000,000 | 3,700,000 |
Accumulated depreciation |  |  | 1,464,000 | 2,041,000 |
Compensating Balances [Line Items] |  |  |  |  |
Compensating balance |  |  | 14,300,000 |  |
Certificates of deposit |  |  | 329,000 |  |
Decrease in lender holdbacks |  |  | 10,738,000 | 3,780,000 | 1,891,000
Increase in lender holdbacks for improvements |  |  | 1,204,000 | 11,045,000 | 2,466,000
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Provision |  |  | $ 967,000 | $ 434,000 | $ 665,000
INCOME TAXES [Abstract] |  |  |  |  |
Minimum dividend distribution percentage (in hundredths) |  |  | 90.00% |  |
Dividend distribution percentage (in hundredths) |  |  | 90.00% | 90.00% | 90.00%
Distribution of federal income tax (in hundredths) |  |  |  | 25.74% | 28.41%
Distribution of capital gain (in hundredths) |  |  |  | 23.09% | 3.09%
Distribution made as return of capital (in hundredths) |  |  |  | 51.17% | 68.50%
Other Liabilities [Line Items] |  |  |  |  |
Proceeds from sale of property | $ 7,900,000 |  |  |  |
Contract for deed | 29,000,000 |  |  |  |
Sale lease-back recorded in other liabilities | 7,900,000 |  |  |  |
Unusual or Infrequent Item [Line Items] |  |  |  |  |
Number of 32-unit buildings | Unit |  |  |  |  | 2
Number of units in building | Unit |  |  |  |  | 32
Number of buildings destroyed | Property |  |  |  |  | 1
Total gain on involuntary conversion |  |  | $ 0 | $ 2,480,000 | $ 5,084,000
Insurance proceeds received for reimbursement for business interruption (loss of rents) |  |  |  |  | 409,000
Number of 15-unit buildings | Unit |  |  | 1 |  |
Number of 57-unit buildings | Unit |  |  | 1 |  |
Insurance proceeds received for flood clean up costs and redevelopment |  |  | $ 6,000,000 |  |
Subsequent Event [Member] |  |  |  |  |
RECLASSIFICATIONS |  |  |  |  |
Number of reportable segments | Segment |  | 3 |  |  |
Discontinued Operations, Held-for-sale [Member] |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Impairment of real estate investments |  |  |  | 36,700,000 |
Buildings and Improvements [Member] | Minimum [Member] |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Estimated useful life of assets (in years) |  |  | 20 years |  |
Buildings and Improvements [Member] | Maximum [Member] |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Estimated useful life of assets (in years) |  |  | 40 years |  |
Furniture, Fixtures and Equipment [Member] | Minimum [Member] |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Estimated useful life of assets (in years) |  |  | 5 years |  |
Furniture, Fixtures and Equipment [Member] | Maximum [Member] |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Estimated useful life of assets (in years) |  |  | 12 years |  |
Renovations and Improvements [Member] | Minimum [Member] |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Estimated useful life of assets (in years) |  |  | 5 years |  |
Renovations and Improvements [Member] | Maximum [Member] |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Estimated useful life of assets (in years) |  |  | 10 years |  |
Kalispell, Montana, Retail Property [Member] |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Impairment of retail property |  |  | $ 2,100,000 |  |
Number of impaired properties | Property |  |  | 1 |  |
Golden Valley, Minnesota, Office Property [Member] |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Impairment of retail property |  |  | $ 183,000 | $ 2,100,000 |
Number of impaired properties | Property |  |  | 1 | 1 |
Minneapolis, Minnesota, Office Property [Member] |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Impairment of retail property |  |  | $ 1,800,000 |  |
Number of impaired properties | Property |  |  | 1 |  |
Boise, Idaho, Office Property [Member] |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Impairment of retail property |  |  | $ 1,400,000 |  |
Number of impaired properties | Property |  |  | 1 |  |
Eagan, Minnesota, Unimproved Land [Member] |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Impairment of retail property |  |  | $ 98,000 |  | $ 305,000
Number of impaired properties | Property |  |  | 1 |  | 1
Weston, Wisconsin, Unimproved Land [Member] |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Impairment of retail property |  |  | $ 442,000 |  |
Number of impaired properties | Property |  |  | 1 |  |
St. Louis Park, Minnesota, Industrial Property [Member] |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Impairment of retail property |  |  |  | $ 864,000 |
Number of impaired properties | Property |  |  |  | 1 |
Bloomington, Minnesota, Office Property [Member] |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Impairment of retail property |  |  |  | $ 329,000 |
Number of impaired properties | Property |  |  |  | 1 |
Anoka, Minnesota, Retail Property [Member] |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Impairment of retail property |  |  |  | $ 265,000 |
Number of impaired properties | Property |  |  |  | 1 |
Clive, Iowa, Industrial Property [Member] |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Impairment of retail property |  |  |  | $ 402,000 |
Number of impaired properties | Property |  |  |  | 1 |
Roseville, Minnesota, Industrial Property [Member] |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Impairment of retail property |  |  |  | $ 4,800,000 |
Number of impaired properties | Property |  |  |  | 1 |
Edina, Minnesota, Office Property [Member] |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Impairment of retail property |  |  |  | $ 835,000 |
Number of impaired properties | Property |  |  |  | 1 |
Various states, Office Property [Member] |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Impairment of retail property |  |  |  | $ 34,900,000 |
Number of impaired properties | Property |  |  |  | 8 |
Number of states in which impaired properties are located | State |  |  |  | 4 |
Number of properties in portfolio | Property |  |  |  | 9 |
Various states, Office Property [Member] | Loans Payable [Member] | CMBS Loan [Member] |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Non-recourse loan |  |  | $ 122,600,000 |  |
Residential Property [Member] |  |  |  |  |
IDENTIFIED INTANGIBLE ASSETS AND LIABILITIES AND GOODWILL [Abstract] |  |  |  |  |
Number of real estate properties disposed | Property |  |  | 1 |  |
Commercial Property [Member] |  |  |  |  |
IDENTIFIED INTANGIBLE ASSETS AND LIABILITIES AND GOODWILL [Abstract] |  |  |  |  |
Number of real estate properties disposed | Property |  |  | 2 |  |
Commercial Healthcare [Member] | Discontinued Operations, Held-for-sale [Member] | Subsequent Event [Member] |  |  |  |  |
RECLASSIFICATIONS |  |  |  |  |
Number of properties | Property |  | 1 |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Number of real estate properties classified as held for sale | $ / shares |  | 1 |  |  |
Retail Property [Member] | Discontinued Operations, Held-for-sale [Member] | Subsequent Event [Member] |  |  |  |  |
RECLASSIFICATIONS |  |  |  |  |
Number of properties | Property |  | 17 |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Number of real estate properties classified as held for sale | $ / shares |  | 17 |  |  |
Office Property [Member] |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Number of real estate properties classified as held for sale | Property |  |  | 1 | 1 |
Office Property [Member] | Discontinued Operations, Held-for-sale [Member] | Subsequent Event [Member] |  |  |  |  |
RECLASSIFICATIONS |  |  |  |  |
Number of properties | Property |  | 48 |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Number of real estate properties classified as held for sale | $ / shares |  | 48 |  |  |
Medical Property [Member] |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Number of real estate properties classified as held for sale | Property |  |  | 1 |  |
Assets held for sale |  |  | $ 22,900,000 |  |
Medical Property [Member] | Various states, Office Property [Member] | Loans Payable [Member] | CMBS Loan [Member] |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Maturity date |  |  |  | Oct. 06, 2016 |
Allowance for Doubtful Accounts [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Balance at beginning of year | $ 1,393,000 | $ 1,156,000 | 1,044,000 | $ 1,393,000 | $ 1,363,000
Provision |  |  | 967,000 | 434,000 | 665,000
Write-off |  |  | (855,000) | (783,000) | (635,000)
Balance at close of year |  |  | 1,156,000 | 1,044,000 | 1,393,000
Flood [Member] |  |  |  |  |
Unusual or Infrequent Item [Line Items] |  |  |  |  |
Proceeds from final settlement |  |  | 8,500,000 |  |
Total gain on involuntary conversion |  |  |  | 0 | 2,821,000
2012 Fire [Member] |  |  |  |  |
Unusual or Infrequent Item [Line Items] |  |  |  |  |
Proceeds from final settlement |  |  | 5,100,000 |  |
Total gain on involuntary conversion |  |  |  | 2,480,000 | $ 2,263,000
2013 Fire [Member] |  |  |  |  |
Unusual or Infrequent Item [Line Items] |  |  |  |  |
Insurance proceeds received for flood clean up costs and redevelopment |  |  |  | 1,000,000 |
2013 Fire [Member] | Building One [Member] |  |  |  |  |
Unusual or Infrequent Item [Line Items] |  |  |  |  |
Number of units in building | Unit |  |  |  |  | 15
2013 Fire [Member] | Building Two [Member] |  |  |  |  |
Unusual or Infrequent Item [Line Items] |  |  |  |  |
Number of units in building | Unit |  |  |  |  | 57
IRET - Minot Apartments, LLC [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Total estimated cost for joint venture |  |  | $ 52,200,000 |  |
Percentage of ownership in VIE (in hundredths) |  |  | 52.90% |  |
IRET - Minot Apartments, LLC [Member] | Third Party Debt [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Percentage of project financed (in hundredths) |  |  | 69.00% |  |
IRET - Minot Apartments, LLC [Member] | Debt from IRET [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Percentage of project financed (in hundredths) |  |  | 7.00% |  |
IRET - Minot Apartments, LLC [Member] | Real Estate Development Company [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Percentage of ownership in VIE (in hundredths) |  |  | 47.10% |  |
IRET - 71 France, LLC [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Total estimated cost for joint venture |  |  | $ 73,300,000 |  |
Number of other partners in joint venture | Partners |  |  | 2 |  |
Percentage of ownership in VIE (in hundredths) |  |  | 52.60% |  |
Threshold in-service period of project |  |  | 24 months |  |
IRET - 71 France, LLC [Member] | Third Party Debt [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Percentage of project financed (in hundredths) |  |  | 69.00% |  |
IRET - 71 France, LLC [Member] | Debt from IRET [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Percentage of project financed (in hundredths) |  |  | 7.00% |  |
IRET - 71 France, LLC [Member] | Real Estate Development Company [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Percentage of ownership in VIE (in hundredths) |  |  | 47.40% |  |
Discontinued Operations [Member] |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |
Impairment of real estate investments |  |  | $ 1,442,000 | $ 36,726,000 | $ 305,000
Dacotah Bank, Minot, North Dakota [Member] |  |  |  |  |
Compensating Balances [Line Items] |  |  |  |  |
Compensating balance |  |  | $ 350,000 |  |
Remaining terms of certificates of deposit |  |  | 2 years |  |
United Community Bank, Minot, North Dakota [Member] |  |  |  |  |
Compensating Balances [Line Items] |  |  |  |  |
Compensating balance |  |  | $ 275,000 |  |
Remaining terms of certificates of deposit |  |  | 6 months |  |
First International Bank, Watford City, North Dakota [Member] |  |  |  |  |
Compensating Balances [Line Items] |  |  |  |  |
Compensating balance |  |  | $ 6,100,000 |  |
First International Bank, Watford City, North Dakota [Member] | Discontinued Operations, Held-for-sale [Member] |  |  |  |  |
Compensating Balances [Line Items] |  |  |  |  |
Compensating balance |  |  | 1,400,000 |  |
Peoples State Bank of Velva, North Dakota [Member] |  |  |  |  |
Compensating Balances [Line Items] |  |  |  |  |
Compensating balance |  |  | 225,000 |  |
Associated Bank, Green Bay, Wisconsin [Member] |  |  |  |  |
Compensating Balances [Line Items] |  |  |  |  |
Compensating balance |  |  | 3,600,000 |  |
American National Bank, Omaha, Nebraska [Member] |  |  |  |  |
Compensating Balances [Line Items] |  |  |  |  |
Compensating balance |  |  | 400,000 |  |
Private Bank [Member] |  |  |  |  |
Compensating Balances [Line Items] |  |  |  |  |
Compensating balance |  |  | 2,000,000 |  |
Commerce Bank [Member] |  |  |  |  |
Compensating Balances [Line Items] |  |  |  |  |
Compensating balance |  |  | 100,000 |  |
Bremer Bank [Member] |  |  |  |  |
Compensating Balances [Line Items] |  |  |  |  |
Compensating balance |  |  | 1,300,000 |  |
Financing Liability [Member] |  |  |  |  |
Other Liabilities [Line Items] |  |  |  |  |
Financing liability balance |  |  | $ 7,900,000 |  |

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