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ACQUISITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE AND DISPOSITIONS, PROPERTY DISPOSITIONS (Details) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2015 USD ($) ft² Property Apartment | Apr. 30, 2014 USD ($) ft² Unit
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Sale price | $ 76,048 | $ 80,883
Book value and sales cost | 69,590 | 73,884
Gain/(Loss) | $ 6,458 | 6,999
Multi-Family Residential [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Sale price |  | 3,510
Book value and sales cost |  | 3,738
Gain/(Loss) |  | $ (228)
Number of properties sold | Property | 1 |
Multi-Family Residential [Member] | Lancaster - St. Cloud, MN [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed | Sep. 22, 2014 |
Sale price | $ 4,451 |
Book value and sales cost | 3,033 |
Gain/(Loss) | $ 1,418 |
Number of apartment units | Apartment | 83 |
Multi-Family Residential [Member] | East Park - Sioux Falls, SD [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed |  | Dec. 18, 2013
Sale price |  | $ 2,214
Book value and sales cost |  | 2,358
Gain/(Loss) |  | $ (144)
Number of apartment units | Unit |  | 84
Multi-Family Residential [Member] | Sycamore Village - Sioux Falls, SD [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed |  | Dec. 18, 2013
Sale price |  | $ 1,296
Book value and sales cost |  | 1,380
Gain/(Loss) |  | $ (84)
Number of apartment units | Unit |  | 48
Commercial Office [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Sale price | $ 45,100 | $ 12,950
Book value and sales cost | 44,858 | 14,504
Gain/(Loss) | $ 242 | $ (1,554)
Number of properties sold | Property | 12 |
Commercial Office [Member] | Dewey Hill - Edina, MN [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed | May 19, 2014 |
Sale price | $ 3,100 |
Book value and sales cost | 3,124 |
Gain/(Loss) | $ (24) |
Area of real estate property | ft² | 73,338 |
Commercial Office [Member] | Wirth Corporate Center - Golden Valley, MN [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed | Aug. 29, 2014 |
Sale price | $ 4,525 |
Book value and sales cost | 4,695 |
Gain/(Loss) | $ (170) |
Area of real estate property | ft² | 74,568 |
Commercial Office [Member] | Northgate I - Maple Grove, MN [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed | Dec. 01, 2014 |
Sale price | $ 7,200 |
Book value and sales cost | 6,881 |
Gain/(Loss) | $ 319 |
Area of real estate property | ft² | 79,297 |
Commercial Office [Member] | Northgate II - Maple Grove, MN [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed | Mar. 02, 2015 |
Sale price | $ 2,725 |
Book value and sales cost | 1,727 |
Gain/(Loss) | $ 998 |
Area of real estate property | ft² | 26,000 |
Commercial Office [Member] | Burnsville Bluffs II - Burnsville, MN [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed | Mar. 25, 2015 |
Sale price | $ 1,245 |
Book value and sales cost | 2,245 |
Gain/(Loss) | $ (1,000) |
Area of real estate property | ft² | 45,019 |
Commercial Office [Member] | Plymouth I - Plymouth, MN [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed | Mar. 25, 2015 |
Sale price | $ 1,985 |
Book value and sales cost | 1,492 |
Gain/(Loss) | $ 493 |
Area of real estate property | ft² | 26,186 |
Commercial Office [Member] | Plymouth II - Plymouth, MN [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed | Mar. 25, 2015 |
Sale price | $ 1,625 |
Book value and sales cost | 1,356 |
Gain/(Loss) | $ 269 |
Area of real estate property | ft² | 26,186 |
Commercial Office [Member] | Plymouth III - Plymouth, MN [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed | Mar. 25, 2015 |
Sale price | $ 2,500 |
Book value and sales cost | 1,977 |
Gain/(Loss) | $ 523 |
Area of real estate property | ft² | 26,186 |
Commercial Office [Member] | Plymouth IV & V - Plymouth, MN [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed | Mar. 25, 2015 |
Sale price | $ 12,910 |
Book value and sales cost | 11,706 |
Gain/(Loss) | $ 1,204 |
Area of real estate property | ft² | 126,936 |
Commercial Office [Member] | Southeast Tech Center - Eagan, MN [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed | Mar. 25, 2015 |
Sale price | $ 3,300 |
Book value and sales cost | 4,196 |
Gain/(Loss) | $ (896) |
Area of real estate property | ft² | 58,300 |
Commercial Office [Member] | Whitewater Plaza - Minnetonka, MN [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed | Mar. 25, 2015 |
Sale price | $ 3,035 |
Book value and sales cost | 4,625 |
Gain/(Loss) | $ (1,590) |
Area of real estate property | ft² | 61,138 |
Commercial Office [Member] | 2030 Cliff Road - Eagan, MN [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed | Apr. 21, 2015 |
Sale price | $ 950 |
Book value and sales cost | 834 |
Gain/(Loss) | $ 116 |
Area of real estate property | ft² | 13,374 |
Commercial Office [Member] | Bloomington Business Plaza - Bloomington, MN [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed |  | Sep. 12, 2013
Sale price |  | $ 4,500
Book value and sales cost |  | 7,339
Gain/(Loss) |  | $ (2,839)
Area of real estate property | ft² |  | 121,669
Commercial Office [Member] | Nicollett VII - Burnsville, MN [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed |  | Sep. 12, 2013
Sale price |  | $ 7,290
Book value and sales cost |  | 6,001
Gain/(Loss) |  | $ 1,289
Number of apartment units | ft² |  | 118,125
Commercial Office [Member] | Pillsbury Business Center - Bloomington, MN [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed |  | Sep. 12, 2013
Sale price |  | $ 1,160
Book value and sales cost |  | 1,164
Gain/(Loss) |  | $ (4)
Number of apartment units | ft² |  | 42,929
Healthcare [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Number of properties sold | Property | 1 |
Healthcare [Member] | Jamestown Medical Office Building - Jamestown, ND [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed | Feb. 05, 2015 |
Sale price | $ 12,819 |
Book value and sales cost | 8,710 |
Gain/(Loss) | $ 4,109 |
Area of real estate property | ft² | 45,222 |
Commercial Industrial [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Sale price |  | $ 61,138
Book value and sales cost |  | 52,079
Gain/(Loss) |  | $ 9,059
Number of properties sold | Property | 1 |
Commercial Industrial [Member] | Eagan 2785 & 2795 - Eagan, MN [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed | Jul. 15, 2014 |
Sale price | $ 3,600 |
Book value and sales cost | 5,393 |
Gain/(Loss) | $ (1,793) |
Area of real estate property | ft² | 198,600 |
Commercial Industrial [Member] | Bodycote Industrial Building - Eden Prairie, MN [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed |  | May 13, 2013
Sale price |  | $ 3,150
Book value and sales cost |  | 1,375
Gain/(Loss) |  | $ 1,775
Area of real estate property | ft² |  | 41,880
Commercial Industrial [Member] | Fargo 1320 45th Street N - Fargo, ND [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed |  | May 13, 2013
Sale price |  | $ 4,700
Book value and sales cost |  | 4,100
Gain/(Loss) |  | $ 600
Area of real estate property | ft² |  | 42,244
Commercial Industrial [Member] | Metal Improvement Company - New Brighton, MN [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed |  | May 13, 2013
Sale price |  | $ 2,350
Book value and sales cost |  | 1,949
Gain/(Loss) |  | $ 401
Area of real estate property | ft² |  | 49,620
Commercial Industrial [Member] | Roseville 2929 Long Lake Road - Roseville, MN [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed |  | May 13, 2013
Sale price |  | $ 9,275
Book value and sales cost |  | 9,998
Gain/(Loss) |  | $ (723)
Area of real estate property | ft² |  | 172,057
Commercial Industrial [Member] | Brooklyn Park 7401 Boone Avenue - Brooklyn Park, MN [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed |  | Sep. 12, 2013
Sale price |  | $ 12,800
Book value and sales cost |  | 12,181
Gain/(Loss) |  | $ 619
Area of real estate property | ft² |  | 322,751
Commercial Industrial [Member] | Cedar Lake Business Center - St. Louis Park, MN [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed |  | Sep. 12, 2013
Sale price |  | $ 2,550
Book value and sales cost |  | 2,607
Gain/(Loss) |  | $ (57)
Area of real estate property | ft² |  | 50,400
Commercial Industrial [Member] | API Building - Duluth, MN [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed |  | Sep. 24, 2013
Sale price |  | $ 2,553
Book value and sales cost |  | 1,488
Gain/(Loss) |  | $ 1,065
Area of real estate property | ft² |  | 35,000
Commercial Industrial [Member] | Lighthouse - Duluth, MN [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed |  | Oct. 08, 2013
Sale price |  | $ 1,825
Book value and sales cost |  | 1,547
Gain/(Loss) |  | $ 278
Area of real estate property | ft² |  | 59,292
Commercial Industrial [Member] | Dixon Avenue Industrial Park - Des Moines, IA [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed |  | Oct. 31, 2013
Sale price |  | $ 14,675
Book value and sales cost |  | 10,328
Gain/(Loss) |  | $ 4,347
Area of real estate property | ft² |  | 606,006
Commercial Industrial [Member] | Winsted Industrial Building - Winsted, MN [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed |  | Jan. 17, 2014
Sale price |  | $ 725
Book value and sales cost |  | 747
Gain/(Loss) |  | $ (22)
Area of real estate property | ft² |  | 41,685
Commercial Industrial [Member] | Minnetonka 13600 County Road 62 - Minnetonka, MN [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed |  | Jan. 30, 2014
Sale price |  | $ 3,800
Book value and sales cost |  | 3,084
Gain/(Loss) |  | $ 716
Area of real estate property | ft² |  | 69,984
Commercial Industrial [Member] | Clive 2075 NW 94th Street - Clive, IA [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed |  | Jan. 30, 2014
Sale price |  | $ 2,735
Book value and sales cost |  | 2,675
Gain/(Loss) |  | $ 60
Area of real estate property | ft² |  | 42,510
Retail [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Sale price | $ 9,250 | $ 3,285
Book value and sales cost | 6,768 | 3,563
Gain/(Loss) | $ 2,482 | $ (278)
Number of properties sold | Property | 3 |
Retail [Member] | Weston Retail - Weston, WI [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed | Jul. 28, 2014 |
Book value and sales cost | $ 1,176 |
Gain/(Loss) | $ (1,176) |
Area of real estate property | ft² | 25,644 |
Retail [Member] | Kalispell Retail - Kalispell, MT [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed | Oct. 15, 2014 |
Sale price | $ 1,230 |
Book value and sales cost | 1,229 |
Gain/(Loss) | $ 1 |
Area of real estate property | ft² | 52,000 |
Retail [Member] | Fargo Express Center & SC Pad - Fargo, ND [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed | Nov. 18, 2014 |
Sale price | $ 2,843 |
Book value and sales cost | 2,211 |
Gain/(Loss) | $ 632 |
Area of real estate property | ft² | 34,226 |
Retail [Member] | Weston Walgreens - Weston, WI [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed | Feb. 27, 2015 |
Sale price | $ 5,177 |
Book value and sales cost | 2,152 |
Gain/(Loss) | $ 3,025 |
Area of real estate property | ft² | 14,820 |
Retail [Member] | Eagan Community - Eagan, MN [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed |  | May 14, 2013
Sale price |  | $ 2,310
Book value and sales cost |  | 2,420
Gain/(Loss) |  | $ (110)
Area of real estate property | ft² |  | 23,187
Retail [Member] | Anoka Strip Center - Anoka, MN [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed |  | Dec. 23, 2013
Sale price |  | $ 325
Book value and sales cost |  | 347
Gain/(Loss) |  | $ (22)
Area of real estate property | ft² |  | 10,625
Retail [Member] | Burnsville 2 Strip Center - Burnsville, MN [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed |  | Jan. 08, 2014
Sale price |  | $ 650
Book value and sales cost |  | 796
Gain/(Loss) |  | $ (146)
Area of real estate property | ft² |  | 8,400
Unimproved Land [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Sale price | $ 828 |
Book value and sales cost | 828 |
Gain/(Loss) | $ 0 |
Number of properties sold | Property | 2 |
Unimproved Land [Member] | Kalispell Unimproved - Kalispell, MT [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed | Oct. 15, 2014 |
Sale price | $ 670 |
Book value and sales cost | 670 |
Gain/(Loss) | $ 0 |
Unimproved Land [Member] | Weston - Weston, WI [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Date disposed | Feb. 17, 2015 |
Sale price | $ 158 |
Book value and sales cost | 158 |
Gain/(Loss) | $ 0 |

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