ACQUISITIONS, DEVELOPMENTS PLACED IN SERVICE AND DISPOSITIONS, PROPERTY ACQUISITIONS (Details) (USD $)	6 Months Ended
	Oct. 31, 2014		Oct. 31, 2013
Acquisitions and development projects placed in service [Abstract]
Transaction costs expensed	$ 104,000		$ 161,000
Goodwill, Acquired During Period	852,000
Results of operations from acquired properties [Abstract]
Total revenue	1,003,000		573,000
Net (loss) income	38,000		(233,000)
Acquisitions [Member]
Acquisitions and development projects placed in service [Abstract]
Total acquisition cost	36,738,000		34,779,000
Cash	23,056,000		29,399,000
Units	100,000	[1]	3,480,000	[1]
Other	13,582,000	[2]	1,900,000	[3]
Land	11,712,000		6,413,000
Building	24,661,000		27,473,000
Intangible assets	365,000		893,000
Acquisitions [Member] | Multi-Family Residential [Member]
Acquisitions and development projects placed in service [Abstract]
Total acquisition cost	26,780,000		19,600,000
Cash	14,511,000		16,120,000
Units	100,000	[1]	3,480,000	[1]
Other	12,169,000	[2]	0	[3]
Land	1,754,000		1,492,000
Building	24,661,000		17,583,000
Intangible assets	365,000		525,000
Acquisitions [Member] | Commercial Healthcare [Member]
Acquisitions and development projects placed in service [Abstract]
Total acquisition cost			11,370,000
Cash			11,370,000
Units			0	[1]
Other			0	[3]
Land			1,112,000
Building			9,890,000
Intangible assets			368,000
Acquisitions [Member] | Unimproved Land [Member]
Acquisitions and development projects placed in service [Abstract]
Total acquisition cost	9,958,000		3,809,000
Cash	8,545,000		1,909,000
Units	0	[1]	0	[1]
Other	1,413,000	[2]	1,900,000	[3]
Land	9,958,000		3,809,000
Building	0		0
Intangible assets	0		0
Acquisitions [Member] | 71 France Phase I - Edina, MN [Member] | Unimproved Land [Member]
Acquisitions and development projects placed in service [Abstract]
Date Acquisition	Jun. 12, 2014	[4]
Total acquisition cost	1,413,000	[4]
Cash	0	[4]
Units	0	[1],[4]
Other	1,413,000	[2],[4]
Land	1,413,000	[4]
Building	0	[4]
Intangible assets	0	[4]
Interest held (in hundredths)	52.60%	[4]
JV Partner Contributions	1,400,000	[4]
Acquisitions [Member] | Alps Park - Rapid City, SD [Member] | Multi-Family Residential [Member]
Acquisitions and development projects placed in service [Abstract]
Date Acquisition	May 01, 2013
Total acquisition cost			6,200,000
Cash			2,920,000
Units			3,280,000	[1]
Other			0	[3]
Land			287,000
Building			5,551,000
Intangible assets			362,000
Number of units			71
Acquisitions [Member] | Chateau II - Minot, ND [Member] | Unimproved Land [Member]
Acquisitions and development projects placed in service [Abstract]
Date Acquisition	May 21, 2013
Total acquisition cost			179,000
Cash			179,000
Units			0	[1]
Other			0	[3]
Land			179,000
Building			0
Intangible assets			0
Acquisitions [Member] | Creekside Crossing - Bismarck, ND [Member] | Unimproved Land [Member]
Acquisitions and development projects placed in service [Abstract]
Date Acquisition	May 22, 2014
Total acquisition cost	4,269,000
Cash	4,269,000
Units	0	[1]
Other	0	[2]
Land	4,269,000
Building	0
Intangible assets	0
Acquisitions [Member] | Homestead Garden - Rapid City, SD [Member] | Multi-Family Residential [Member]
Acquisitions and development projects placed in service [Abstract]
Date Acquisition	Jun. 02, 2014	[5]
Total acquisition cost	15,000,000	[5]
Cash	5,092,000	[5]
Other	9,908,000	[2],[5]
Land	655,000	[5]
Building	14,139,000	[5]
Intangible assets	206,000	[5]
Number of units	152	[5]
Goodwill, Acquired During Period	852,000	[5]
Noncash or Part Noncash Acquisition, Debt Assumed	9,900,000	[5]
Acquisitions [Member] | PrairieCare Medical - Brooklyn Park, MN [Member] | Unimproved Land [Member]
Acquisitions and development projects placed in service [Abstract]
Date Acquisition	Jun. 05, 2014
Total acquisition cost	2,616,000
Cash	2,616,000
Units	0	[1]
Other	0	[2]
Land	2,616,000
Building	0
Intangible assets	0
Acquisitions [Member] | Jamestown Unimproved - Jamestown, ND [Member] | Unimproved Land [Member]
Acquisitions and development projects placed in service [Abstract]
Date Acquisition	Aug. 09, 2013
Total acquisition cost			700,000
Cash			700,000
Units			0	[1]
Other			0	[3]
Land			700,000
Building			0
Intangible assets			0
Acquisitions [Member] | Legends at Heritage Place - Sartell, MN [Member] | Commercial Healthcare [Member]
Acquisitions and development projects placed in service [Abstract]
Date Acquisition	Oct. 31, 2013
Total acquisition cost			11,370,000
Cash			11,370,000
Units			0	[1]
Other			0	[3]
Land			1,112,000
Building			9,890,000
Intangible assets			368,000
Area of property			98,174
Acquisitions [Member] | Legends at Heritage Place - Sartell, MN [Member] | Unimproved Land [Member]
Acquisitions and development projects placed in service [Abstract]
Date Acquisition	Oct. 31, 2013
Total acquisition cost			1,030,000
Cash			1,030,000
Units			0	[1]
Other			0	[3]
Land			1,030,000
Building			0
Intangible assets			0
Acquisitions [Member] | Monticello 7th Addition - Monticello, MN [Member] | Unimproved Land [Member]
Acquisitions and development projects placed in service [Abstract]
Date Acquisition	Oct. 09, 2014
Total acquisition cost	1,660,000
Cash	1,660,000
Units	0	[1]
Other	0	[2]
Land	1,660,000
Building	0
Intangible assets	0
Acquisitions [Member] | Northridge - Bismarck, ND [Member] | Multi-Family Residential [Member]
Acquisitions and development projects placed in service [Abstract]
Date Acquisition	Sep. 12, 2014
Total acquisition cost	8,500,000
Cash	8,400,000
Units	100,000	[1]
Other	0	[2]
Land	884,000
Building	7,516,000
Intangible assets	100,000
Number of units	68
Acquisitions [Member] | Pinecone Villas - Sartell, MN [Member] | Multi-Family Residential [Member]
Acquisitions and development projects placed in service [Abstract]
Date Acquisition	Oct. 31, 2013
Total acquisition cost			2,800,000
Cash			2,800,000
Units	0	[1]	0	[1]
Other			0	[3]
Land			629,000
Building			2,139,000
Intangible assets			32,000
Number of units			24
Acquisitions [Member] | RED 20 - Minneapolis, MN [Member] | Unimproved Land [Member]
Acquisitions and development projects placed in service [Abstract]
Date Acquisition	Aug. 20, 2013	[6]
Total acquisition cost			1,900,000	[6]
Cash			0	[6]
Units			0	[1],[6]
Other			1,900,000	[3],[6]
Land			1,900,000	[6]
Building			0	[6]
Intangible assets			0	[6]
Interest held (in hundredths)			58.60%	[6]
Acquisitions [Member] | Silver Springs - Rapid City, SD [Member] | Multi-Family Residential [Member]
Acquisitions and development projects placed in service [Abstract]
Date Acquisition	Jun. 02, 2014
Total acquisition cost	3,280,000
Cash	1,019,000
Other	2,261,000	[2]
Land	215,000
Building	3,006,000
Intangible assets	59,000
Number of units	52
Noncash or Part Noncash Acquisition, Debt Assumed	2,300,000
Acquisitions [Member] | Southpoint - Grand Forks, ND [Member] | Multi-Family Residential [Member]
Acquisitions and development projects placed in service [Abstract]
Date Acquisition	Sep. 05, 2013
Total acquisition cost			10,600,000
Cash			10,400,000
Units	0	[1],[5]	200,000	[1]
Other			0	[3]
Land			576,000
Building			9,893,000
Intangible assets			$ 131,000
Number of units			96

[1] Value of limited partnership units of the Operating Partnership at the acquisition date.

[2] 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 - $1.4 million).

[3] Consists of value of land contributed by the joint venture partner.

[4] Land is owned by a joint venture in which the Company has an approximately 52.6% interest. The joint venture is consolidated in IRETs financial statements.

[5] At acquisition the Company adjusted the assumed debt to fair value and recognized approximately $852,000 of goodwill.

[6] Land is owned by a joint venture in which the Company has an approximately 58.6% interest. The joint venture is consolidated in IRETs financial statements