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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Jul. 31, 2014 Redemption Property | Jul. 31, 2013 | Apr. 30, 2014
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES [Abstract] |  |  |
Interest in operating partnership (in hundredths) | 86.50% |  | 83.80%
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 |  |
Real Estate Properties [Line Items] |  |  |
Impairment of retail property | $ 2,320,000 | $ 1,803,000 |
Impairment of retail property attributable to discontinued operations | 0 |  |
Number of impaired properties | 2 |  |
Compensating Balances [Line Items] |  |  |
Compensating balances | 10,000,000 |  |
Remaining terms of certificates of deposit | 6 months | 2 years |
Decrease in lender holdbacks | 609,000 | 1,144,000 |
Increase in lender holdbacks | 326,000 | 279,000 |
Dacotah Bank, Minot, North Dakota [Member] |  |  |
Compensating Balances [Line Items] |  |  |
Compensating balances | 350,000 |  |
Commerce Bank [Member] |  |  |
Compensating Balances [Line Items] |  |  |
Compensating balances | 100,000 |  |
United Community Bank, Minot, North Dakota [Member] |  |  |
Compensating Balances [Line Items] |  |  |
Compensating balances | 275,000 |  |
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 |  |
Associated Bank, Green Bay, Wisconsin [Member] |  |  |
Compensating Balances [Line Items] |  |  |
Compensating balances | 600,000 |  |
American National Bank, Omaha, Nebraska [Member] |  |  |
Compensating Balances [Line Items] |  |  |
Compensating balances | 400,000 |  |
Private Bank [Member] |  |  |
Compensating Balances [Line Items] |  |  |
Compensating balances | 2,000,000 |  |
United Community and Dacotah Bank [Member] | Other Investments [Member] |  |  |
Compensating Balances [Line Items] |  |  |
Certificates of deposit | 329,000 |  |
Anoka, Minnesota [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Impairment of retail property | 265,000 |  |
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 |  |
Clive, Iowa [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Impairment of retail property | 345,000 |  |
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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- Definition The charge against earnings of discontinued operations or disposal group in the period to reduce the carrying amount of real property to fair value. + References No definition available. + Details
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- Definition The minimum number of units required for a limited partner to exercise the redemption, unless such limited partner holds less than this minimum, in which case the minimum number of units is equal to the number of units held by such limited partner. + References No definition available. + Details
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- Definition A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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