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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) | 9 Months Ended |  | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  | 9 Months Ended
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Jan. 31, 2013 | Jan. 31, 2012 | Apr. 30, 2012 | Jan. 31, 2013 Acquired below-market leases and acquired above-market leases [Member] | Jan. 31, 2012 Acquired below-market leases and acquired above-market leases [Member] | Jan. 31, 2013 Acquired below-market leases and acquired above-market leases [Member] | Jan. 31, 2012 Acquired below-market leases and acquired above-market leases [Member] | Jan. 31, 2013 Other identified intangible assets [Member] | Jan. 31, 2012 Other identified intangible assets [Member] | Jan. 31, 2013 Other identified intangible assets [Member] | Jan. 31, 2012 Other identified intangible assets [Member] | Jan. 31, 2013 Dacotah Bank, Minot, North Dakota [Member] | Jan. 31, 2013 United Community Bank, Minot, North Dakota [Member] | Jan. 31, 2013 Commerce Bank, A Minnesota Banking Corporation [Member] | Jan. 31, 2013 First International Bank, Watford City, North Dakota [Member] | Jan. 31, 2013 Peoples State Bank of Velva, North Dakota [Member] | Jan. 31, 2013 Equity Bank, Minnetonka, Minnesota [Member] | Jan. 31, 2013 Associated Bank, Green Bay, Wisconsin [Member] | Jan. 31, 2013 Venture Bank, Eagan, Minnesota [Member] | Jan. 31, 2013 American National Bank, Omaha, Nebraska [Member] | Jan. 31, 2013 United Community Bank and Equity Bank [Member] | Jan. 31, 2013 Kentwood property [Member] | Jan. 31, 2012 Kentwood property [Member]
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest in common units in operating partnership (in hundredths) | 81.50% |  | 81.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | $ 0 | $ 135,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 128,000
Goodwill impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,000 |
Compensating Balances [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensating balances | 8,900,000 |  |  |  |  |  |  |  |  |  |  | 350,000 | 275,000 | 250,000 | 6,100,000 | 225,000 | 300,000 | 500,000 | 500,000 | 400,000 | 638,000 |  |
Decrease in lender holdbacks | 1,514,000 | 5,056,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in lender holdbacks | 1,962,000 | 315,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IDENTIFIED INTANGIBLE ASSETS AND INTANGIBLE LIABILITIES AND GOODWILL [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired | 813,000 | 416,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average lives of intangible assets and intangible liabilities | 6 months | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Gross, Total | 67,608,000 |  | 92,401,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization | (26,599,000) |  | (47,813,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net, Total | 41,009,000 |  | 44,588,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indentified intangible liabilities, gross | 391,000 |  | 1,104,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indentified intangible liabilities, accumulated amortization | (288,000) |  | (967,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indentified intangible liabilities, net | 103,000 |  | 137,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of Intangible Assets |  |  |  | (7,000) | (8,000) | (21,000) | (40,000) | 1,200,000 | 1,200,000 | 4,300,000 | 4,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Estimated annual amortization [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 |  |  |  | 37,000 |  | 37,000 |  | 4,146,000 |  | 4,146,000 |  |  |  |  |  |  |  |  |  |  |  |  |
2015 |  |  |  | 18,000 |  | 18,000 |  | 3,825,000 |  | 3,825,000 |  |  |  |  |  |  |  |  |  |  |  |  |
2016 |  |  |  | 14,000 |  | 14,000 |  | 3,608,000 |  | 3,608,000 |  |  |  |  |  |  |  |  |  |  |  |  |
2017 |  |  |  | 6,000 |  | 6,000 |  | 3,139,000 |  | 3,139,000 |  |  |  |  |  |  |  |  |  |  |  |  |
2018 |  |  |  | (5,000) |  | (5,000) |  | 2,652,000 |  | 2,652,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 1,106,000 |  | 1,120,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,000 |
Goodwill derecognized | 14,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RECLASSIFICATIONS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of multi-family residential properties sold | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
INVOLUNTARY CONVERSION OF ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of 32-unit buildings | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expensed flood and fire insurance deductibles | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deductible amount for losses to be covered under insurance policy |  | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance proceeds received for flood clean up costs and redevelopment |  |  | 5,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated gain on involuntary conversion | 2,300,000 | 274,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance proceeds received for redevelopment | 2,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance proceeds received for business interruption from the flood and fire | 409,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance proceeds received for total business interruption proceeds | 666,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance claim on total business interruption | $ 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph e -Clause 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph l -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 34 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 43 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 72 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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