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ACQUISITIONS, DEVELOPMENTS PLACED IN SERVICE AND DISPOSITIONS, PROPERTY DISPOSITIONS (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2014 | Oct. 31, 2013 | Jan. 31, 2014 Property
Dispositions [Abstract] |  |  |
Sales price | $ 17,576 | $ 69,138 |
Book value and sales cost | 19,320 | 62,497 |
Gain/(loss) | (1,744) | 6,641 |
Multi-Family Residential [Member] |  |  |
Dispositions [Abstract] |  |  |
Sales price | 4,451 |  |
Book value and sales cost | 3,033 |  |
Gain/(loss) | 1,418 |  |
Number of properties sold |  |  | 2
Multi-Family Residential [Member] | Lancaster St Cloud MN [Member] |  |  |
Dispositions [Abstract] |  |  |
Date disposed | Sep. 22, 2014 |  |
Sales price | 4,451 |  |
Book value and sales cost | 3,033 |  |
Gain/(loss) | 1,418 |  |
Number of apartment units dispositions (in units) | 83 |  |
Commercial Office [Member] |  |  |
Dispositions [Abstract] |  |  |
Sales price | 7,625 | 12,950 |
Book value and sales cost | 7,819 | 14,504 |
Gain/(loss) | (194) | (1,554) |
Number of properties sold |  |  | 3
Commercial Office [Member] | Bloomington Business Plaza, Bloomington, Minnesota [Member] |  |  |
Dispositions [Abstract] |  |  |
Date disposed | Sep. 12, 2013 |  |
Sales price |  | 4,500 |
Book value and sales cost |  | 7,339 |
Gain/(loss) |  | (2,839) |
Area of a real estate property (in square feet) |  | 121,669 |
Commercial Office [Member] | Nicollet VII, Burnsville, Minnesota [Member] |  |  |
Dispositions [Abstract] |  |  |
Date disposed | Sep. 12, 2013 |  |
Sales price |  | 7,290 |
Book value and sales cost |  | 6,001 |
Gain/(loss) |  | 1,289 |
Area of a real estate property (in square feet) |  | 118,125 |
Commercial Office [Member] | Pillsbury Business Center, Bloomington, Minnesota [Member] |  |  |
Dispositions [Abstract] |  |  |
Date disposed | Sep. 12, 2013 |  |
Sales price |  | 1,160 |
Book value and sales cost |  | 1,164 |
Gain/(loss) |  | (4) |
Area of a real estate property (in square feet) |  | 42,929 |
Commercial Office [Member] | Dewey Hill - Edina, MN [Member] |  |  |
Dispositions [Abstract] |  |  |
Date disposed | May 19, 2014 |  |
Sales price | 3,100 |  |
Book value and sales cost | 3,124 |  |
Gain/(loss) | (24) |  |
Area of a real estate property (in square feet) | 73,338 |  |
Commercial Office [Member] | Wirth Corporate Center Golden Valley MN [Member] |  |  |
Dispositions [Abstract] |  |  |
Date disposed | Aug. 29, 2014 |  |
Sales price | 4,525 |  |
Book value and sales cost | 4,695 |  |
Gain/(loss) | (170) |  |
Area of a real estate property (in square feet) | 74,568 |  |
Commercial Industrial [Member] |  |  |
Dispositions [Abstract] |  |  |
Sales price | 3,600 | 53,878 |
Book value and sales cost | 5,393 | 45,573 |
Gain/(loss) | (1,793) | 8,305 |
Number of properties sold |  |  | 12
Commercial Industrial [Member] | Eagan 2785 & 2795 - Eagan, MN [Member] |  |  |
Dispositions [Abstract] |  |  |
Date disposed | Jul. 15, 2014 |  |
Sales price | 3,600 |  |
Book value and sales cost | 5,393 |  |
Gain/(loss) | (1,793) |  |
Area of a real estate property (in square feet) | 198,600 |  |
Commercial Industrial [Member] | Bodycote Industrial Building Eden Prairie MN [Member] |  |  |
Dispositions [Abstract] |  |  |
Date disposed | 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 |
Commercial Industrial [Member] | Fargo 1320 45th St N Fargo ND [Member] |  |  |
Dispositions [Abstract] |  |  |
Date disposed | 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 |
Commercial Industrial [Member] | Metal Improvement Company New Brighton MN [Member] |  |  |
Dispositions [Abstract] |  |  |
Date disposed | 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 |
Commercial Industrial [Member] | Roseville 2929 Long Lake Road - Roseville, MN [Member] |  |  |
Dispositions [Abstract] |  |  |
Date disposed | 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 |
Commercial Industrial [Member] | Brooklyn Park 7401 Boone Avenue, Brooklyn Park, Minnesota [Member] |  |  |
Dispositions [Abstract] |  |  |
Date disposed | Sep. 12, 2013 |  |
Sales price |  | 12,800 |
Book value and sales cost |  | 12,181 |
Gain/(loss) |  | 619 |
Area of a real estate property (in square feet) |  | 322,751 |
Commercial Industrial [Member] | Cedar Lake Business Center, St. Louis Park, Minnesota [Member] |  |  |
Dispositions [Abstract] |  |  |
Date disposed | Sep. 12, 2013 |  |
Sales price |  | 2,550 |
Book value and sales cost |  | 2,607 |
Gain/(loss) |  | (57) |
Area of a real estate property (in square feet) |  | 50,400 |
Commercial Industrial [Member] | API Building, Duluth, Minnesota [Member] |  |  |
Dispositions [Abstract] |  |  |
Date disposed | Sep. 24, 2013 |  |
Sales price |  | 2,553 |
Book value and sales cost |  | 1,488 |
Gain/(loss) |  | 1,065 |
Area of a real estate property (in square feet) |  | 35,000 |
Commercial Industrial [Member] | Lighthouse Duluth MN [Member] |  |  |
Dispositions [Abstract] |  |  |
Date disposed | Oct. 08, 2013 |  |
Sales price |  | 1,825 |
Book value and sales cost |  | 1,547 |
Gain/(loss) |  | 278 |
Area of a real estate property (in square feet) |  | 59,292 |
Commercial Industrial [Member] | Dixon Avenue Industrial Park, Des Moines, Iowa [Member] |  |  |
Dispositions [Abstract] |  |  |
Date disposed | Oct. 31, 2013 |  |
Sales price |  | 14,675 |
Book value and sales cost |  | 10,328 |
Gain/(loss) |  | 4,347 |
Area of a real estate property (in square feet) |  | 606,006 |
Commercial Retail [Member] |  |  |
Dispositions [Abstract] |  |  |
Sales price | 1,230 | 2,310 |
Book value and sales cost | 2,405 | 2,420 |
Gain/(loss) | (1,175) | (110) |
Commercial Retail [Member] | Weston Retail Weston WI [Member] |  |  |
Dispositions [Abstract] |  |  |
Date disposed | Jul. 28, 2014 |  |
Sales price | 0 |  |
Book value and sales cost | 1,176 |  |
Gain/(loss) | (1,176) |  |
Area of a real estate property (in square feet) | 25,644 |  |
Commercial Retail [Member] | Kalispell Retail - Kalispell, MT [Member] |  |  |
Dispositions [Abstract] |  |  |
Date disposed | Oct. 15, 2014 |  |
Sales price | 1,230 |  |
Book value and sales cost | 1,229 |  |
Gain/(loss) | 1 |  |
Area of a real estate property (in square feet) | 52,000 |  |
Commercial Retail [Member] | Eagan Community Eagan MN [Member] |  |  |
Dispositions [Abstract] |  |  |
Date disposed | 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 |
Unimproved Land [Member] |  |  |
Dispositions [Abstract] |  |  |
Sales price | 670 |  |
Book value and sales cost | 670 |  |
Gain/(loss) | 0 |  |
Unimproved Land [Member] | Kalispell Unimproved - Kalispell, MT [Member] |  |  |
Dispositions [Abstract] |  |  |
Date disposed | Oct. 15, 2014 |  |
Sales price | 670 |  |
Book value and sales cost | 670 |  |
Gain/(loss) | $ 0 |  |

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