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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Oct. 31, 2014 | Oct. 31, 2014 Property Redemption | Oct. 31, 2013 | Apr. 30, 2014
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES [Abstract] |  |  |  |
Interest in operating partnership (in hundredths) | 89.10% | 89.10% |  | 83.80%
Redemption basis |  | one-for-one |  |
Redemptions by limited partner, maximum |  | 2 |  |
Number of units to redeem, minimum (in units) | 1,000 | 1,000 |  |
Period to hold the beneficial interest, minimum |  | 1 year |  |
Real Estate Properties [Line Items] |  |  |  |
Impairment of retail property |  | $ 5,565,000 | $ 1,860,000 |
Impairment of retail property attributable to discontinued operations |  | 0 |  |
Number of impaired properties |  | 4 |  |
Held For Sale [Line Items] |  |  |  |
Liabilities related to real estate held for sale | 22,100,000 | 22,100,000 |  |
Compensating Balances [Line Items] |  |  |  |
Compensating balances | 10,700,000 | 10,700,000 |  |
Remaining terms of certificates of deposit | 2 months |  |  |
Decrease in lender holdbacks | 4,840,000 | 4,840,000 | 1,610,000 |
Increase in lender holdbacks | 621,000 | 621,000 | 562,000 |
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 | 650,000 | 650,000 |  |
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 | 600,000 | 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 |  |
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 |  |
St. Louis Park, Minnesota [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Impairment of retail property |  | $ 864,000 |  |
Number of impaired properties |  | 1 |  |

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