ACQUISITIONS, DEVELOPMENTS PLACED IN SERVICE AND DISPOSITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE (Details)		6 Months Ended			12 Months Ended
		Oct. 31, 2015 USD ($) ft² Unit		Oct. 31, 2014 USD ($) Unit	Apr. 30, 2015 USD ($)	Apr. 30, 2014 USD ($)
Business Acquisition [Line Items]
Land		$ 6,424,000		$ 11,712,000
Building		64,144,000		24,661,000
Multifamily [Member]
Business Acquisition [Line Items]
Land		5,521,000		1,754,000
Building		59,035,000		24,661,000
Unimproved Land [Member]
Business Acquisition [Line Items]
Land				9,958,000
Building				0
Development Projects Placed in Service [Member]
Business Acquisition [Line Items]
Land		6,819,000	[1]	823,000
Building		130,168,000	[1]	9,452,000
Development Cost		136,987,000	[1]	$ 10,275,000
Development Projects Placed in Service [Member] | Multifamily [Member]
Business Acquisition [Line Items]
Land	[1]	3,320,000
Building	[1]	73,841,000
Development Cost	[1]	$ 77,161,000
Development Projects Placed in Service [Member] | Multifamily [Member] | 72 unit - Chateau II - Minot, ND [Member]
Business Acquisition [Line Items]
Date Placed in Service	[1],[2]	Jun. 01, 2015
Land	[1],[2]	$ 240,000
Building	[1],[2]	14,401,000
Development Cost	[1],[2]	14,641,000
Development cost paid		$ 2,300,000			$ 12,300,000
Number of apartment units owned | Unit	[1],[2]	72
Development Projects Placed in Service [Member] | Multifamily [Member] | 288 unit - Renaissance Heights - Williston, ND [Member]
Business Acquisition [Line Items]
Date Placed in Service	[1],[3]	Jul. 27, 2015
Land	[1],[3]	$ 3,080,000
Building	[1],[3]	59,440,000
Development Cost	[1],[3]	62,520,000
Development cost paid		$ 4,800,000			57,700,000
Interest in joint venture		70.00%
Number of apartment units owned | Unit	[1],[3]	288
Development Projects Placed in Service [Member] | Multifamily [Member] | 44 unit - Dakota Commons - Williston, ND [Member]
Business Acquisition [Line Items]
Date Placed in Service	[4]			Jul. 15, 2014
Land	[4]			$ 823,000
Building	[4]			9,452,000
Development Cost	[4]			$ 10,275,000
Development cost paid					2,200,000	$ 8,100,000
Number of apartment units owned | Unit	[4]			44
Development Projects Placed in Service [Member] | Healthcare [Member]
Business Acquisition [Line Items]
Land	[1]	$ 2,610,000
Building	[1]	54,594,000
Development Cost	[1]	$ 57,204,000
Development Projects Placed in Service [Member] | Healthcare [Member] | 57,624 sq ft Edina 6565 France SMC III - Edina, MN [Member]
Business Acquisition [Line Items]
Date Placed in Service	[1],[5]	Jun. 01, 2015
Land	[1],[5]	$ 0
Building	[1],[5]	32,495,000
Development Cost	[1],[5]	32,495,000
Development cost paid		$ 11,700,000			20,800,000
Area of real estate property | ft²	[1],[5]	57,624
Development Projects Placed in Service [Member] | Healthcare [Member] | 70,756 sq ft PrairieCare Medical - Brooklyn Park, MN [Member]
Business Acquisition [Line Items]
Date Placed in Service	[1],[6]	Sep. 08, 2015
Land	[1],[6]	$ 2,610,000
Building	[1],[6]	22,099,000
Development Cost	[1],[6]	24,709,000
Development cost paid		$ 7,400,000			17,300,000
Area of real estate property | ft²	[1],[6]	70,756
Development Projects Placed in Service [Member] | Other [Member] | 7,963 sq ft Minot Southgate Retail - Minot, ND [Member]
Business Acquisition [Line Items]
Date Placed in Service	[1],[7]	Oct. 01, 2015
Land	[1],[7]	$ 889,000
Building	[1],[7]	1,733,000
Development Cost	[1],[7]	2,622,000
Development cost paid		$ 500,000			$ 2,100,000
Area of real estate property | ft²	[1],[7]	7,963

[1] Development projects that are placed in service in phases are excluded from this table until the entire project has been placed in service. See Note 6 for additional information on the Deer Ridge, 71 France, and Cardinal Point projects, which were partially placed in service during the three months ended October, 2015.

[2] Costs paid in prior fiscal years totaled $12.3 million. Additional costs paid in fiscal year 2016 totaled $2.3 million, for a total project cost at October 31, 2015 of $14.6 million.

[3] Costs paid in prior fiscal years totaled $57.7 million. Additional costs paid in fiscal year 2016 totaled $4.8 million, for a total project cost at October 31, 2015 of $62.5 million. The project is owned by a joint venture entity in which we have an approximately 70.0% interest. The joint venture is consolidated in our financial statements.

[4] Costs paid in prior fiscal years totaled $8.1 million. Additional costs paid in fiscal year 2015 totaled $2.2 million, for a total project cost at October 31, 2014 of $10.3 million.

[5] Costs paid in prior fiscal years totaled $20.8 million. Additional costs paid in fiscal year 2016 totaled $11.7 million, for a total project cost at October 31, 2015 of $32.5 million.

[6] Costs paid in prior fiscal years totaled $17.3 million. Additional costs paid in fiscal year 2016 totaled $7.4 million, for a total project cost at October 31, 2015 of $24.7 million.

[7] Costs paid in prior fiscal years totaled $2.1 million. Additional costs paid in fiscal year 2016 totaled approximately $500,000, for a total project cost at October 31, 2015 of $2.6 million.