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ACQUISITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE AND DISPOSITIONS, ACQUISITIONS (Details) - USD ($)
 12 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Apr. 30, 2014
Business Acquisition [Line Items]      
Transaction costs expensed during the period $ 253,000 $ 216,000  
Acquisitions and development projects placed in service [Abstract]      
Partnership units issued 18,226,000 800,000 $ 3,480,000
Gain on bargain purchase 3,424,000    
Goodwill, acquired during period   852,000  
Results of operations from acquired properties [Abstract]      
Total revenue 4,094,000 2,565,000  
Net loss (366,000) (1,000)  
74 unit - Gardens - Grand Forks, ND [Member]      
Acquisitions and development projects placed in service [Abstract]      
Partnership units issued 44,000    
187 unit - Avalon Cove - Rochester, MN [Member]      
Acquisitions and development projects placed in service [Abstract]      
Partnership units issued 2,500,000    
Northridge - Bismarck, ND [Member]      
Acquisitions and development projects placed in service [Abstract]      
Partnership units issued   11,000  
Legacy Heights - Bismarck, ND [Member]      
Acquisitions and development projects placed in service [Abstract]      
Partnership units issued   77,000  
Acquisitions Member      
Acquisitions and development projects placed in service [Abstract]      
Total acquisition costs 143,500,000 56,297,000  
Form of consideration, cash 121,850,000 38,606,000  
Form of consideration, units 18,226,000 [1] 800,000 [2]  
Form of consideration, other [3]   16,891,000  
Investment allocation, land 10,259,000 17,478,000  
Investment allocation, building 131,159,000 38,403,000  
Investment allocation, intangible assets 2,082,000 416,000  
Acquisitions Member | Multi-Family Residential [Member]      
Acquisitions and development projects placed in service [Abstract]      
Total acquisition costs 137,000,000 41,780,000  
Form of consideration, cash 115,350,000 28,811,000  
Form of consideration, units 18,226,000 [1] 800,000 [2]  
Form of consideration, other [3]   12,169,000  
Investment allocation, land 9,356,000 2,961,000  
Investment allocation, building 126,050,000 38,403,000  
Investment allocation, intangible assets $ 1,594,000 $ 416,000  
Acquisitions Member | Multi-Family Residential [Member] | 74 unit - Gardens - Grand Forks, ND [Member]      
Acquisitions and development projects placed in service [Abstract]      
Date acquired Sep. 10, 2015    
Total acquisition costs $ 9,250,000    
Form of consideration, cash 8,850,000    
Form of consideration, units [1] 400,000    
Investment allocation, land 518,000    
Investment allocation, building 8,672,000    
Investment allocation, intangible assets $ 60,000    
Acquisitions Member | Multi-Family Residential [Member] | 276 unit - GrandeVille at Cascade Lake - Rochester, MN [Member]      
Acquisitions and development projects placed in service [Abstract]      
Date acquired Oct. 29, 2015    
Total acquisition costs $ 56,000,000    
Form of consideration, cash 56,000,000    
Investment allocation, land 5,003,000    
Investment allocation, building 50,363,000    
Investment allocation, intangible assets $ 634,000    
Acquisitions Member | Multi-Family Residential [Member] | 187 unit - Avalon Cove - Rochester, MN [Member]      
Acquisitions and development projects placed in service [Abstract]      
Date acquired Mar. 22, 2016    
Total acquisition costs $ 36,250,000    
Form of consideration, cash 15,000,000    
Form of consideration, units [1] 17,826,000    
Investment allocation, land 1,616,000    
Investment allocation, building 34,145,000    
Investment allocation, intangible assets $ 489,000    
Acquisitions Member | Multi-Family Residential [Member] | 90 unit - Cascade Shores - Rochester, MN [Member]      
Acquisitions and development projects placed in service [Abstract]      
Date acquired Mar. 22, 2016    
Total acquisition costs $ 18,500,000    
Form of consideration, cash 18,500,000    
Investment allocation, land 1,585,000    
Investment allocation, building 16,710,000    
Investment allocation, intangible assets $ 205,000    
Acquisitions Member | Multi-Family Residential [Member] | 76 unit - Crystal Bay - Rochester, MN [Member]      
Acquisitions and development projects placed in service [Abstract]      
Date acquired Mar. 22, 2016    
Total acquisition costs $ 12,000,000    
Form of consideration, cash 12,000,000    
Investment allocation, land 433,000    
Investment allocation, building 11,425,000    
Investment allocation, intangible assets $ 142,000    
Acquisitions Member | Multi-Family Residential [Member] | 40-unit - French Creek - Rochester, MN [Member]      
Acquisitions and development projects placed in service [Abstract]      
Date acquired Mar. 22, 2016    
Total acquisition costs $ 5,000,000    
Form of consideration, cash 5,000,000    
Investment allocation, land 201,000    
Investment allocation, building 4,735,000    
Investment allocation, intangible assets $ 64,000    
Acquisitions Member | Multi-Family Residential [Member] | 152 unit - Homestead Garden - Rapid City, SD [Member]      
Acquisitions and development projects placed in service [Abstract]      
Date acquired [4]   Jun. 02, 2014  
Total acquisition costs [4]   $ 15,000,000  
Form of consideration, cash [4]   5,092,000  
Form of consideration, other [3],[4]   9,908,000  
Investment allocation, land [4]   655,000  
Investment allocation, building [4]   14,139,000  
Investment allocation, intangible assets [4]   $ 206,000  
Acquisitions Member | Multi-Family Residential [Member] | 52 unit - Silver Springs - Rapid City, SD [Member]      
Acquisitions and development projects placed in service [Abstract]      
Date acquired   Jun. 02, 2014  
Total acquisition costs   $ 3,280,000  
Form of consideration, cash   1,019,000  
Form of consideration, other [3]   2,261,000  
Investment allocation, land   215,000  
Investment allocation, building   3,006,000  
Investment allocation, intangible assets   59,000  
Acquisitions Member | Multi-Family Residential [Member] | Homestead Garden - Rapid City, SD [Member]      
Acquisitions and development projects placed in service [Abstract]      
Assumed debt   9,900,000  
Acquisitions Member | Multi-Family Residential [Member] | Silver Springs - Rapid City, SD [Member]      
Acquisitions and development projects placed in service [Abstract]      
Assumed debt   $ 2,300,000  
Acquisitions Member | Multi-Family Residential [Member] | Northridge - Bismarck, ND [Member]      
Acquisitions and development projects placed in service [Abstract]      
Date acquired   Sep. 12, 2014  
Total acquisition costs   $ 8,500,000  
Form of consideration, cash   8,400,000  
Form of consideration, units [2]   100,000  
Investment allocation, land   884,000  
Investment allocation, building   7,516,000  
Investment allocation, intangible assets   $ 100,000  
Acquisitions Member | Multi-Family Residential [Member] | Legacy Heights - Bismarck, ND [Member]      
Acquisitions and development projects placed in service [Abstract]      
Date acquired [5]   Mar. 19, 2015  
Total acquisition costs [5]   $ 15,000,000  
Form of consideration, cash [5]   14,300,000  
Form of consideration, units [2],[5]   700,000  
Investment allocation, land [5]   1,207,000  
Investment allocation, building [5]   13,742,000  
Investment allocation, intangible assets [5]   51,000  
Land in development   804,000  
Building in development   7,800,000  
Ecsrow   1,300,000  
Acquisitions Member | Healthcare [Member] | 27,819 sq ft Lakeside Medical Plaza - Omaha, NE [Member]      
Acquisitions and development projects placed in service [Abstract]      
Date acquired Aug. 20, 2015    
Total acquisition costs $ 6,500,000    
Form of consideration, cash 6,500,000    
Investment allocation, land 903,000    
Investment allocation, building 5,109,000    
Investment allocation, intangible assets $ 488,000    
Acquisitions Member | Unimproved Land [Member]      
Acquisitions and development projects placed in service [Abstract]      
Total acquisition costs   14,517,000  
Form of consideration, cash   9,795,000  
Form of consideration, other [3]   4,722,000  
Investment allocation, land   $ 14,517,000  
Acquisitions Member | Unimproved Land [Member] | Creekside Crossing - Bismarck, ND [Member]      
Acquisitions and development projects placed in service [Abstract]      
Date acquired   May 22, 2014  
Total acquisition costs   $ 4,269,000  
Form of consideration, cash   4,269,000  
Investment allocation, land   $ 4,269,000  
Acquisitions Member | Unimproved Land [Member] | PrairieCare Medical - Brooklyn Park, MN [Member]      
Acquisitions and development projects placed in service [Abstract]      
Date acquired   Jun. 05, 2014  
Total acquisition costs   $ 2,616,000  
Form of consideration, cash   2,616,000  
Investment allocation, land   $ 2,616,000  
Acquisitions Member | Unimproved Land [Member] | 71 France Phase I - Edina, MN [Member]      
Acquisitions and development projects placed in service [Abstract]      
Date acquired [6]   Jun. 12, 2014  
Total acquisition costs [6]   $ 1,413,000  
Form of consideration, other [3],[6]   1,413,000  
Investment allocation, land [6]   $ 1,413,000  
Acquisitions Member | Unimproved Land [Member] | Monticello 7th Addition - Monticello, MN [Member]      
Acquisitions and development projects placed in service [Abstract]      
Date acquired   Oct. 09, 2014  
Total acquisition costs   $ 1,660,000  
Form of consideration, cash   1,660,000  
Investment allocation, land   $ 1,660,000  
Acquisitions Member | Unimproved Land [Member] | 71 France Phase 2 & 3 - Edina, MN [Member]      
Acquisitions and development projects placed in service [Abstract]      
Date acquired [6]   Nov. 04, 2014  
Total acquisition costs [6]   $ 3,309,000  
Form of consideration, other [3],[6]   3,309,000  
Investment allocation, land [6]   $ 3,309,000  
Interest in joint venture (in hundredths)   52.60%  
Acquisitions Member | Unimproved Land [Member] | 71 France Phases I, II & III      
Acquisitions and development projects placed in service [Abstract]      
JV Partner Contributions   $ 4,700,000  
Acquisitions Member | Unimproved Land [Member] | Minot 1525 24th Ave SW - Minot, ND [Member]      
Acquisitions and development projects placed in service [Abstract]      
Date acquired   Dec. 23, 2014  
Total acquisition costs   $ 1,250,000  
Form of consideration, cash   1,250,000  
Investment allocation, land   $ 1,250,000  
[1] Value of Units of the Operating Partnership based on the closing market price of our common stock on the acquisition date. The number of Units issued were approximately 44,000 and 2.5 million, respectively, for the Gardens and Avalon Cove acquisitions.Acquisition resulted in a gain on bargain purchase of approximately $3.4 million. See Note 2 for additional information.
[2] Value of limited partnership units of the Operating Partnership
[3] Consists of assumed debt (Homestead Garden I: $9.9 million, Silver Springs: $2.3 million) and value of land contributed by the joint venture partner (71 France: $4.7 million).
[4] At acquisition, we adjusted the assumed debt to fair value and recognized approximately $852,000 of goodwill.
[5] At acquisition, the purchase price included assets in development (land: $804,000, building: $7.8 million, escrow $1.3 million).
[6] Land was contributed to a joint venture in which we have an approximately 52.6% interest. The joint venture is consolidated in our financial statements.