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ACQUISITIONS AND DISPOSITIONS (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Jul. 31, 2013 | Jul. 31, 2012
Acquisitions and development projects placed in service [Abstract] |  |  |
Land | $ 466 | $ 4,320 |
Buildings | 5,551 | 47,328 |
Intangible assets | 362 | 752 |
Acquisition costs | 6,379 | 52,400 |
Results of operations from acquired properties [Abstract] |  |  |
Total revenue | 186 | 1,232 |
Net income | (108) | (72) |
Dispositions [Abstract] |  |  |
Sales price | 21,785 | 955 |
Book value and sales cost | 19,842 | 1,028 |
Gain/(Loss) | 1,943 | (73) |
Commercial Industrial [Member] |  |  |
Dispositions [Abstract] |  |  |
Sales price | 19,475 |  |
Book value and sales cost | 17,422 |  |
Gain/(Loss) | 2,053 |  |
Alps Park - Rapid City, SD [Member] | Multi-Family Residential [Member] |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |
Date Acquisition | May 01, 2013 |  |
Land | 287 |  |
Buildings | 5,551 |  |
Intangible assets | 362 |  |
Acquisition costs | 6,200 |  |
Number of apartment units | 71 |  |
Bodycote - Eden Prairie, MN [Member] | Commercial Industrial [Member] |  |  |
Dispositions [Abstract] |  |  |
Date Disposal | May 13, 2013 |  |
Sales price | 3,150 |  |
Book value and sales cost | 1,375 |  |
Gain/(Loss) | 1,775 |  |
Area of a real estate property (in square feet) | 41,880 |  |
Chateau II - Minot, ND [Member] | Unimproved Land [Member] |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |
Date Acquisition | May 21, 2013 |  |
Land | 179 |  |
Buildings | 0 |  |
Intangible assets | 0 |  |
Acquisition costs | 179 |  |
Colony Lincoln, NE [Member] | Multi-Family Residential [Member] |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |
Date Acquisition |  | Jun. 04, 2012 |
Land |  | 1,515 |
Buildings |  | 15,731 |
Intangible assets |  | 254 |
Acquisition costs |  | 17,500 |
Number of apartment units |  | 232 |
Fargo 1320 45th St. N - Fargo, ND [Member] | Commercial Industrial [Member] |  |  |
Dispositions [Abstract] |  |  |
Date Disposal | May 13, 2013 |  |
Sales price | 4,700 |  |
Book value and sales cost | 4,100 |  |
Gain/(Loss) | 600 |  |
Area of a real estate property (in square feet) | 42,244 |  |
Eagan - Eagan, MN [Member] | Commercial Retail [Member] |  |  |
Dispositions [Abstract] |  |  |
Date Disposal | May 14, 2013 |  |
Sales price | 2,310 |  |
Book value and sales cost | 2,420 |  |
Gain/(Loss) | (110) |  |
Area of a real estate property (in square feet) | 23,187 |  |
Georgetown Square Condominiums 5 and 6 [Member] | Other Disposition [Member] |  |  |
Dispositions [Abstract] |  |  |
Date Disposal |  | Jun. 21, 2012 |
Sales price |  | 330 |
Book value and sales cost |  | 336 |
Gain/(Loss) |  | (6) |
Kentwood Thomasville Kentwood, MI [Member] | Commercial Retail [Member] |  |  |
Dispositions [Abstract] |  |  |
Date Disposal |  | Jun. 20, 2012 |
Sales price |  | 625 |
Book value and sales cost |  | 692 |
Gain/(Loss) |  | (67) |
Area of a real estate property (in square feet) |  | 16,080 |
Lakeside Village Lincoln, NE [Member] | Multi-Family Residential [Member] |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |
Date Acquisition |  | Jun. 04, 2012 |
Land |  | 1,215 |
Buildings |  | 15,837 |
Intangible assets |  | 198 |
Acquisition costs |  | 17,250 |
Number of apartment units |  | 208 |
Metal Improvement - New Brighton, MN [Member] | Commercial Industrial [Member] |  |  |
Dispositions [Abstract] |  |  |
Date Disposal | May 13, 2013 |  |
Sales price | 2,350 |  |
Book value and sales cost | 1,949 |  |
Gain/(Loss) | 401 |  |
Area of a real estate property (in square feet) | 49,620 |  |
Roseville 2929 Long Lake Road - Roseville, MN [Member] | Commercial Industrial [Member] |  |  |
Dispositions [Abstract] |  |  |
Date Disposal | May 13, 2013 |  |
Sales price | 9,275 |  |
Book value and sales cost | 9,998 |  |
Gain/(Loss) | (723) |  |
Area of a real estate property (in square feet) | 172,057 |  |
Villa West Topeka, KS [Member] | Multi-Family Residential [Member] |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |
Date Acquisition |  | May 08, 2012 |
Land |  | 1,590 |
Buildings |  | 15,760 |
Intangible assets |  | 300 |
Acquisition costs |  | 17,650 |
Number of apartment units |  | 308 |
Development Projects Placed in Service [Member] |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |
Land |  | 0 |
Buildings |  | 7,701 |
Intangible assets |  | 0 |
Acquisition costs |  | 7,701 |
Development Projects Placed in Service [Member] | Quarry Ridge II Rochester, MN [Member] | Multi-Family Residential [Member] |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |
Date Acquisition |  | Jun. 29, 2012 | [1]
Land |  | 0 | [1]
Buildings |  | 3,543 | [1]
Intangible assets |  | 0 | [1]
Acquisition costs |  | 3,543 | [1]
Number of apartment units |  | 159 | [1]
Development Projects Placed in Service [Member] | Williston Garden Buildings 3 and 4 Williston, ND [Member] | Multi-Family Residential [Member] |  |  |
Acquisitions and development projects placed in service [Abstract] |  |  |
Date Acquisition |  | Jul. 31, 2012 | [2]
Land |  | 0 | [2]
Buildings |  | 4,158 | [2]
Intangible assets |  | 0 | [2]
Acquisition costs |  | $ 4,158 | [2]
Number of apartment units |  | 73 | [2]
[1] | (1) Development property placed in service June 29, 2012. Additional costs paid in fiscal years 2012 and 2011, and land acquired in fiscal year 2007, totaled $13.0 million, for a total project cost at July 31, 2012 of $16.5 million.
[2] | (2) Development property placed in service July 31, 2012. Buildings 1 and 2 were placed in service in fiscal year 2012. Additional costs paid in fiscal year 2012 totaled $12.0 million, for a total project cost at July 31, 2012 of $16.2 million.

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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph r(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. + Details
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- Definition Reflects for the period the total of the carrying amount of the commercial, industrial and residential land and buildings sold plus certain overhead and other costs incurred to place the real estate in saleable condition, capitalized interest costs in the properties sold, and inventory impairment losses recognized. This element would most likely be used by an entity whose principal activities involve real estate or which has significant real estate operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition The gains (losses) included in results of operations resulting from the sale or disposal of property, plant and equipment, which do not qualify for treatment as discontinued operations. This item does not include any gain (loss) recognized on the sale of oil and gas property or timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2941-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2443-110228 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 37, 41, 42, 43, 45 -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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