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COMMITMENTS AND CONTINGENCIES (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Apr. 30, 2013 sqft | Apr. 30, 2012 | Apr. 30, 2011 | Jan. 31, 2012
Real Estate Properties [Line Items] |  |  |  |
Number of properties under operating ground and air rights lease | 12 |  |  |
Rent payable per year under ground lease | $ 500,000 |  |  |
Number of renewal of lease | 6 |  |  |
Operating Leases, Future Minimum Payments [Abstract] |  |  |  |
2014 | 504,000 |  |  |
2015 | 506,000 |  |  |
2016 | 478,000 |  |  |
2017 | 449,000 |  |  |
2018 | 449,000 |  |  |
Thereafter | 21,667,000 |  |  |
Total | 24,053,000 |  |  |
Tenant improvements | 7,500,000 |  |  |
Commitment period for tenant improvements | 12 years |  |  |
Property Cost and Gross Rental Revenue [Abstract] |  |  |  |
Total property cost subject to purchase options | 96,627,000 |  |  |
Total gross rental revenue from properties subject to purchase options | 7,927,000 | 6,250,000 | 4,407,000 |
Number of properties subject to restrictions on taxable dispositions | 112 |  |  |
Area of a real estate property (in square feet) | 6,200,000 |  |  |
Number of apartment units owned | 4,865 |  |  |
Real estate investment amount of properties (net of accumulated depreciation) | 855,300,000 |  |  |
Redemption basis | one-for-one |  |  |
Redemption holding period, minimum | 1 year |  |  |
Number of consecutive trading days for valuation | 10 days |  |  |
Aggregate redemption value of UPREIT Units of operating partnership owned by limited partners | 209,700,000 | 147,800,000 |  |
Joint ventures partner's interest acquired |  |  |  | 1,300,000
Estimated cost of construction | 25,800,000 |  |  |
Arcata Apartments, Golden Valley, MN [Member] |  |  |  |
Property Cost and Gross Rental Revenue [Abstract] |  |  |  |
Area of land (in acres) | 2 |  |  |
Number of apartment units owned | 165 |  |  |
Estimated cost of construction | 33,400,000 |  |  |
Arrowhead First International Bank - Minot ND [Member] |  |  |  |
Property Cost and Gross Rental Revenue [Abstract] |  |  |  |
Area of a real estate property (in square feet) | 3,700 |  |  |
Estimated cost of construction | 1,700,000 |  |  |
Project costs incurred to date | 1,600,000 |  |  |
Bank Office Build-to-Suit, Minot, ND [Member] |  |  |  |
Property Cost and Gross Rental Revenue [Abstract] |  |  |  |
Area of land (in acres) | 1.1 |  |  |
Area of a real estate property (in square feet) | 5,000 |  |  |
Billings 2300 Grant Road - Billings, MT [Member] |  |  |  |
Property Cost and Gross Rental Revenue [Abstract] |  |  |  |
Total property cost subject to purchase options | 2,522,000 |  |  |
Total gross rental revenue from properties subject to purchase options | 299,000 | 291,000 | 226,000 |
Cypress Court Apartment Development St. Cloud, MN [Member] |  |  |  |
Property Cost and Gross Rental Revenue [Abstract] |  |  |  |
Number of apartment units owned | 132 |  |  |
Estimated cost of construction | 14,300,000 |  |  |
Project costs incurred to date | 6,500,000 |  |  |
Number of apartment units placed in service | 2 |  |  |
Interest in joint venture (in hundredths) | 79.00% |  |  |
Interest in joint venture held by joint venture partner (in hundredths) | 21.00% |  |  |
Fargo 1320 45th Street N - Fargo, ND [Member] |  |  |  |
Property Cost and Gross Rental Revenue [Abstract] |  |  |  |
Total property cost subject to purchase options | 4,160,000 |  |  |
Total gross rental revenue from properties subject to purchase options | 400,000 | 400,000 | 333,000 |
First Avenue Apartment Homes, Minot, ND [Member] |  |  |  |
Property Cost and Gross Rental Revenue [Abstract] |  |  |  |
Area of a real estate property (in square feet) | 15,000 |  |  |
Number of apartment units owned | 20 |  |  |
Estimated cost of construction | 3,000,000 |  |  |
Healtheast St John & Woodwinds - Maplewood & Woodbury, MN [Member] |  |  |  |
Property Cost and Gross Rental Revenue [Abstract] |  |  |  |
Total property cost subject to purchase options | 21,601,000 |  |  |
Total gross rental revenue from properties subject to purchase options | 2,152,000 | 2,152,000 | 2,152,000 |
Missoula 3050 Great Northern - Missoula, MT [Member] |  |  |  |
Property Cost and Gross Rental Revenue [Abstract] |  |  |  |
Total property cost subject to purchase options | 2,723,000 |  |  |
Total gross rental revenue from properties subject to purchase options | 323,000 | 315,000 | 243,000 |
Renaissance Heights I Apartments, Williston, ND [Member] |  |  |  |
Property Cost and Gross Rental Revenue [Abstract] |  |  |  |
Area of land (in acres) | 14.5 |  |  |
Number of apartment units owned | 288 |  |  |
Estimated cost of construction | 62,200,000 |  |  |
Interest in joint venture (in hundredths) | 70.00% |  |  |
River Ridge Apartment Homes, Bismarck, ND [Member] |  |  |  |
Property Cost and Gross Rental Revenue [Abstract] |  |  |  |
Number of apartment units owned | 146 |  |  |
Project costs incurred to date | 13,200,000 |  |  |
Sartell 2000 23rd Street South - Sartell, MN [Member] |  |  |  |
Property Cost and Gross Rental Revenue [Abstract] |  |  |  |
Total property cost subject to purchase options | 12,716,000 |  |  |
Total gross rental revenue from properties subject to purchase options | 365,000 | 868,000 | 1,209,000 |
Southgate Apartments, Minot, ND [Member] |  |  |  |
Property Cost and Gross Rental Revenue [Abstract] |  |  |  |
Number of apartment units owned | 341 |  |  |
Estimated cost of construction | 52,200,000 |  |  |
Project costs incurred to date | 13,900,000 |  |  |
Interest in joint venture (in hundredths) | 51.00% |  |  |
Interest in joint venture held by joint venture partner (in hundredths) | 49.00% |  |  |
Spring Creek American Falls- American Falls, ID [Member] |  |  |  |
Property Cost and Gross Rental Revenue [Abstract] |  |  |  |
Total property cost subject to purchase options | 4,070,000 |  |  |
Total gross rental revenue from properties subject to purchase options | 352,000 | 234,000 | 0 |
Spring Creek Boise - Boise, ID [Member] |  |  |  |
Property Cost and Gross Rental Revenue [Abstract] |  |  |  |
Total property cost subject to purchase options | 5,075,000 |  |  |
Total gross rental revenue from properties subject to purchase options | 440,000 | 293,000 | 0 |
Spring Creek Eagle - Eagle, ID [Member] |  |  |  |
Property Cost and Gross Rental Revenue [Abstract] |  |  |  |
Total property cost subject to purchase options | 4,100,000 |  |  |
Total gross rental revenue from properties subject to purchase options | 356,000 | 237,000 | 0 |
Spring Creek Meridian - Meridian, ID [Member] |  |  |  |
Property Cost and Gross Rental Revenue [Abstract] |  |  |  |
Total property cost subject to purchase options | 7,250,000 |  |  |
Total gross rental revenue from properties subject to purchase options | 624,000 | 417,000 | 0 |
Spring Creek Overland - Overland, ID [Member] |  |  |  |
Property Cost and Gross Rental Revenue [Abstract] |  |  |  |
Total property cost subject to purchase options | 6,725,000 |  |  |
Total gross rental revenue from properties subject to purchase options | 580,000 | 387,000 | 0 |
Spring Creek Soda Springs - Soda Springs, ID [Member] |  |  |  |
Property Cost and Gross Rental Revenue [Abstract] |  |  |  |
Total property cost subject to purchase options | 2,262,000 |  |  |
Total gross rental revenue from properties subject to purchase options | 196,000 | 130,000 | 0 |
Spring Creek Ustick - Meridian, ID [Member] |  |  |  |
Property Cost and Gross Rental Revenue [Abstract] |  |  |  |
Total property cost subject to purchase options | 4,300,000 |  |  |
Total gross rental revenue from properties subject to purchase options | 368,000 | 246,000 | 0 |
St. Michael Clinic - St. Michael, MN [Member] |  |  |  |
Property Cost and Gross Rental Revenue [Abstract] |  |  |  |
Total property cost subject to purchase options | 2,851,000 |  |  |
Total gross rental revenue from properties subject to purchase options | 249,000 | 248,000 | 244,000 |
Urbandale - Urbandale, IA [Member] |  |  |  |
Property Cost and Gross Rental Revenue [Abstract] |  |  |  |
Total property cost subject to purchase options | 15,218,000 |  |  |
Total gross rental revenue from properties subject to purchase options | 1,153,000 | 0 | 0 |
Winsted Industrial Building - Winsted, MN [Member] |  |  |  |
Property Cost and Gross Rental Revenue [Abstract] |  |  |  |
Total property cost subject to purchase options | 1,054,000 |  |  |
Total gross rental revenue from properties subject to purchase options | $ 70,000 | $ 32,000 | $ 0 |

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- Definition Amount of real estate investments, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; (7) other real estate investments; (8) real estate joint ventures; and (9) unconsolidated real estate and other joint ventures not separately presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph d -Article 7 + Details
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- Definition The book value of investments in real estate joint ventures including direct and indirect investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Carrying amount as of the balance sheet date of improvements having a life longer than one year that were made for the benefit of one or more tenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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