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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2011 | Oct. 31, 2012
BASIS OF PRESENTATION [Abstract] |  |  |  |
Interest in operating partnership (in hundredths) | 82.40% | 81.50% |  |
Percentage of general interest partnership (in hundredths) | 100.00% |  |  |
Redemption basis | one-for-one |  |  |
Redemptions by limited partner, maximum | 2 |  |  |
Number of units to redeem, minimum (in units) | 1,000 |  |  |
Period to hold the beneficial interest, minimum | 1 year |  |  |
RECLASSIFICATIONS [Abstract] |  |  |  |
Number of retail properties sold | 4 | 2 |  |
Number of properties classified as held for sale | 0 | 8 | 0 |
Number of apartment complexes sold | 3 |  |  |
Iret Number Of Healthcare Properties Sold | 1 |  |  |
Real Estate Properties [Line Items] |  |  |  |
Impairment of retail property | $ 305,000 | $ 428,000 | $ 0 |
Number of impairment properties | 1 | 2 |  |
Goodwill impairment |  | 7,000 |  |
IDENTIFIED INTANGIBLE ASSETS AND LIABILITIES AND GOODWILL [Abstract] |  |  |  |
New intangible assets | 1,600,000 | 416,000 |  |
Addition to intangible liabilities | 0 | 0 |  |
Weighted average lives of intangible assets and intangible liabilities | 6 months | 10 years |  |
Goodwill book value | 1,106,000 | 1,120,000 |  |
Recognized impairment goodwill |  | 7,000 |  |
PROPERTY AND EQUIPMENT [Abstract] |  |  |  |
Property and equipment cost | 2,900,000 | 2,900,000 |  |
Accumulated depreciation | 1,673 | 1,423 |  |
Compensating Balances [Line Items] |  |  |  |
Certificates of deposit | 639,000 |  |  |
Remaining terms of certificates of deposit | 2 years |  |  |
Decrease in lender holdbacks | 1,891,000 | 5,681,000 | 3,276,000 |
Increase in lender holdbacks for improvements | 2,466,000 | 1,730,000 | 10,712,000 |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Balance at beginning of year | 154 |  |  |
Provision | 1,008,000 | (142,000) | 665,000 |
Balance at close of year | 563 | 154 |  |
Income Tax Disclosure [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) |  | 23.17% | 18.04% |
Distribution of capital gain (in hundredths) |  | 2.41% | 37.48% |
Distribution made as return of capital (in hundredths) |  | 74.42% | 44.48% |
INVOLUNTARY CONVERSION OF ASSETS [Abstract] |  |  |  |
Expensed flood and fire insurance deductibles | 400,000 |  |  |
Number of 32-unit buildings | 2 |  |  |
Number of units in building | 32 |  |  |
Number of buildings destroyed |  |  |  | 1
Deductible amount for losses to be covered under insurance policy | 200,000 |  |  |
Insurance proceeds received for flood clean up costs and redevelopment | 2,900,000 | 5,700,000 |  |
Insurance proceeds received for reimbursement for business interruption (loss of rents) | 409,000 | 666,000 |  |
Estimated gain on involuntary conversion | 2,300,000 | 274,000 |  |
Allowance for Doubtful Accounts [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Balance at beginning of year | 1,363,000 | 1,316,000 | 1,172,000 |
Provision | 665,000 | 298,000 | 733,000 |
Write-off | (635,000) | (251,000) | (589,000) |
Balance at close of year | 1,393,000 | 1,363,000 | 1,316,000 |
Dacotah Bank, Minot, North Dakota [Member] |  |  |  |
Compensating Balances [Line Items] |  |  |  |
Compensating balance | 350,000,000 |  |  |
United Community Bank, Minot, North Dakota [Member] |  |  |  |
Compensating Balances [Line Items] |  |  |  |
Compensating balance | 275,000,000 |  |  |
Commerce Bank, A Minnesota Banking Corporation [Member] |  |  |  |
Compensating Balances [Line Items] |  |  |  |
Compensating balance | 250,000,000 |  |  |
First International Bank, Watford City, North Dakota [Member] |  |  |  |
Compensating Balances [Line Items] |  |  |  |
Compensating balance | 6,100,000 |  |  |
Peoples State Bank of Velva, North Dakota [Member] |  |  |  |
Compensating Balances [Line Items] |  |  |  |
Compensating balance | 225,000,000 |  |  |
Equity Bank, Minnetonka, Minnesota [Member] |  |  |  |
Compensating Balances [Line Items] |  |  |  |
Compensating balance | 300,000,000 |  |  |
Associated Bank, Green Bay, Wisconsin [Member] |  |  |  |
Compensating Balances [Line Items] |  |  |  |
Compensating balance | 500,000,000 |  |  |
Venture Bank, Eagan, Minnesota [Member] |  |  |  |
Compensating Balances [Line Items] |  |  |  |
Compensating balance | 500,000,000 |  |  |
American National Bank, Omaha, Nebraska [Member] |  |  |  |
Compensating Balances [Line Items] |  |  |  |
Compensating balance | 400,000,000 |  |  |
Multi-family residential properties [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Number of properties disposed | 2 |  | 4 |
Goodwill derecognized | 14,000 |  | 261,000 |
Kentwood, Michigan, retail property [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Impairment of retail property |  | 128,000 |  |
Grand Chute, Wisconsin [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Impairment of retail property |  | $ 293,000 |  |

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