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Area others.

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Dilutive potential common shares.

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Mortgage notes held by unconsolidated affiliates.

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Ownership in limited liability limited partnership one.

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Retainable taxable income.

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Amount due from customers or clients, more than one year from the balance sheet date, for goods or services that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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Area of a real estate property.

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Principal Activity and Significant Accounting Policies (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Jan. 01, 2009
Principal Activity and Significant Accounting Policies (Textual) [Abstract]
Impairment losses related to the unconsolidated affiliates			$ 0	$ 0
Total Assets held by unconsolidated affiliates	29,000,000		29,000,000
Mortgage notes held by unconsolidated affiliates	21,700,000		21,700,000
Depreciation expenses	2,412,438	2,244,627	7,154,638	6,607,536
Impairment losses relating to investments			0	0
Allowance for uncollectible receivables	0		0		0
Taxable Income to be distributed	90.00%		90.00%
Retainable taxable income	10.00%		10.00%
Unrecognized tax benefit accrual	0		0			0
Revenue from tenant rents and related activities			95.00%
Increase in revenue due to straight - line adjustment	69,641	58,527	202,396	183,231
Straight - line Receivable	$ 1,812,732		$ 1,812,732		$ 1,718,527
Dilutive potential common shares	0		0
Denominators for the basic and diluted earnings per common share	4,958,416	3,781,982	4,538,247	3,761,159
Fair value measurements, highest and best use			Extends the prohibition on blockage factors to all three levels of the fair value hierarchy, and requires additional disclosures
Building and improvements [Member]
Real Estate Properties [Line Items]
Estimated useful life			40 years
Furniture and fixtures [Member]
Real Estate Properties [Line Items]
Estimated useful life			9 years
Grand Forks Marketplace Retail Center [Member] \| Market Place Investors, LLC [Member]
Real Estate Properties [Line Items]
Percentage of interest	33.30%		33.30%
Grand Forks Marketplace Retail Center [Member] \| Operating Partnership [Member]
Real Estate Properties [Line Items]
Percentage of interest	50.00%		50.00%
Retail Center [Member] \| Market Place Investors, LLC [Member]
Real Estate Properties [Line Items]
Percentage of interest	33.30%		33.30%
Fargo, North Dakota [Member]
Real Estate Properties [Line Items]
Number of units in residential property of operating partnership	2,392		2,392
Fargo, North Dakota [Member] \| Operating Partnership [Member] \| 32nd Avenue INREIT, LLC [Member]
Real Estate Properties [Line Items]
Area of Commercial building	31,000		31,000
Fargo, North Dakota [Member] \| Operating Partnership [Member] \| INREIT Somerset, LLC [Member]
Real Estate Properties [Line Items]
Residential apartment buildings, Unit	75		75
Fargo, North Dakota [Member] \| Office Building [Member]
Real Estate Properties [Line Items]
Area of commercial property of operating partnership	17,000		17,000
Fargo, North Dakota [Member] \| Office Building 1 [Member]
Real Estate Properties [Line Items]
Area of commercial property of operating partnership	11,973		11,973
Fargo, North Dakota [Member] \| Office Building 2 [Member]
Real Estate Properties [Line Items]
Area of commercial property of operating partnership	100,600		100,600
Fargo, North Dakota [Member] \| Office and Retail complex [Member]
Real Estate Properties [Line Items]
Area of commercial property of operating partnership	15,000		15,000
Fargo, North Dakota [Member] \| Office and Retail complex 1 [Member]
Real Estate Properties [Line Items]
Area of commercial property of operating partnership	28,500		28,500
Fargo, North Dakota [Member] \| Office complex [Member]
Real Estate Properties [Line Items]
Area of commercial property of operating partnership	124,306		124,306
West Fargo, North Dakota [Member]
Real Estate Properties [Line Items]
Number of units in residential property of operating partnership	204		204
Grand Forks, North Dakota [Member]
Real Estate Properties [Line Items]
Number of units in residential property of operating partnership	551		551
Grand Forks, North Dakota [Member] \| Operating Partnership [Member] \| Autumn Ridge INREIT, LLC [Member]
Real Estate Properties [Line Items]
Residential apartment buildings, Unit	36		36
Number of residential apartment buildings	2		2
Grand Forks, North Dakota [Member] \| Office Building [Member]
Real Estate Properties [Line Items]
Area of commercial property of operating partnership	21,492		21,492
Grand Forks, North Dakota [Member] \| Storage Area [Member]
Real Estate Properties [Line Items]
Area of commercial property of operating partnership	1,625		1,625
Grand Forks, North Dakota [Member] \| Grand Forks Marketplace Retail Center [Member]
Real Estate Properties [Line Items]
Area of Commercial Property	183,000		183,000
Bismarck, North Dakota [Member]
Real Estate Properties [Line Items]
Number of units in residential property of operating partnership	470		470
Bismarck, North Dakota [Member] \| Operating Partnership [Member] \| Sierra Ridge, LLC [Member]
Real Estate Properties [Line Items]
Residential apartment buildings, Unit	136		136
Bismarck, North Dakota [Member] \| Operating Partnership [Member] \| Bismarck Interstate INREIT, LLC [Member]
Real Estate Properties [Line Items]
Area of Commercial building	75,000		75,000
Number of commercial buildings	2		2
Bismarck, North Dakota [Member] \| Operating Partnership [Member] \| INREIT Sunset Ridge, LLC [Member]
Real Estate Properties [Line Items]
Residential apartment buildings, Unit	179		179
Omaha, Nebraska [Member]
Real Estate Properties [Line Items]
Number of units in residential property of operating partnership	316		316
Omaha, Nebraska [Member] \| Operating Partnership [Member] \| INREIT Maple Ridge, LLC [Member]
Real Estate Properties [Line Items]
Residential apartment buildings, Unit	168		168
Omaha, Nebraska [Member] \| Operating Partnership [Member] \| INREIT Stonybrook LLC [Member]
Real Estate Properties [Line Items]
Residential apartment buildings, Unit	148		148
Hawley, Minnesota [Member]
Real Estate Properties [Line Items]
Number of units in residential property of operating partnership	14		14
Eagan, Minnesota [Member]
Real Estate Properties [Line Items]
Number of units in residential property of operating partnership	414		414
Bismarck, North Dakota (Property 1) [Member]
Real Estate Properties [Line Items]
Number of units in residential property of operating partnership	193		193
Minot, North Dakota [Member] \| Office Building [Member]
Real Estate Properties [Line Items]
Area of commercial property of operating partnership	15,010		15,010
Minot, North Dakota [Member] \| Retail Building [Member]
Real Estate Properties [Line Items]
Area of commercial property of operating partnership	23,690		23,690
Norfolk, Nebraska [Member] \| Office Building [Member]
Real Estate Properties [Line Items]
Area of commercial property of operating partnership	8,000		8,000
Waite Park, Minnesota [Member] \| Retail facility [Member]
Real Estate Properties [Line Items]
Area of commercial property of operating partnership	30,200		30,200
St. Cloud, Minnesota [Member] \| Office Building [Member]
Real Estate Properties [Line Items]
Area of commercial property of operating partnership	10,810		10,810
Duluth, Minnesota [Member] \| Office Building [Member]
Real Estate Properties [Line Items]
Area of commercial property of operating partnership	95,961		95,961
Edina, Minnesota [Member] \| Office Building [Member]
Real Estate Properties [Line Items]
Area of commercial property of operating partnership	102,448		102,448
Bloomington, Minnesota [Member] \| Restaurant [Member]
Real Estate Properties [Line Items]
Area of commercial property of operating partnership	5,043		5,043
Coon Rapids, Minnesota [Member] \| Restaurant [Member]
Real Estate Properties [Line Items]
Area of commercial property of operating partnership	5,576		5,576
Savage, Minnesota [Member] \| Restaurant [Member]
Real Estate Properties [Line Items]
Area of commercial property of operating partnership	4,936		4,936
Austin, Texas [Member] \| Restaurant [Member]
Real Estate Properties [Line Items]
Area of commercial property of operating partnership	7,296		7,296
Mandan, North Dakota [Member] \| Commercial Building [Member]
Real Estate Properties [Line Items]
Area of commercial property of operating partnership	15,400		15,400
Apple Valley, Minnesota [Member] \| Restaurant [Member]
Real Estate Properties [Line Items]
Area of commercial property of operating partnership	4,997		4,997
Moorhead, Minnesota [Member]
Real Estate Properties [Line Items]
Number of units in residential property of operating partnership	116		116
Moorhead, Minnesota [Member] \| Office Building [Member]
Real Estate Properties [Line Items]
Area of commercial property of operating partnership	3,510		3,510
Moorhead, Minnesota [Member] \| Restaurant [Member]
Real Estate Properties [Line Items]
Area of commercial property of operating partnership	2,712		2,712
Dickinson, North Dakota [Member] \| Restaurant [Member]
Real Estate Properties [Line Items]
Area of commercial property of operating partnership	2,811		2,811
Dickinson, North Dakota [Member] \| Retail Building [Member]
Real Estate Properties [Line Items]
Area of commercial property of operating partnership	17,760		17,760
Marshall, Minnesota [Member] \| Retail Building [Member]
Real Estate Properties [Line Items]
Area of commercial property of operating partnership	42,000		42,000
Limited Liability Companies (Group 1) [Member] \| Operating Partnership [Member]
Real Estate Properties [Line Items]
Number of Commercial Properties	5		5
Area of Commercial Property	72,140		72,140
Limited Liability Companies (Group 2) [Member] \| Operating Partnership [Member]
Real Estate Properties [Line Items]
Number of Commercial Properties	10		10
Area of Commercial Property	124,686		124,686
Eagle Run Partnership, West Fargo North Dakota [Member] \| Operating Partnership [Member]
Real Estate Properties [Line Items]
Ownership in LLLP	81.25%		81.25%
Residential apartment Complex, Unit	144		144
Highland Meadows, LLLP, Bismarck, North Dakota [Member]
Real Estate Properties [Line Items]
Investment in unconsolidated Affiliates	40.26%		40.26%
Number of residential, multi-tenant apartment complex	144		144
Residential, multi-tenant apartment complex, Units	0		0
Highland Meadows, LLLP, Bismarck, North Dakota [Member] \| Operating Partnership [Member]
Real Estate Properties [Line Items]
Percentage of interest	40.26%		40.26%
Grand Forks Marketplace Retail Center , North Dakota [Member]
Real Estate Properties [Line Items]
Investment in unconsolidated Affiliates	50.00%		50.00%
Area (Others)	183,000		183,000
Tenant in common - Office building, Fargo, North Dakota [Member]
Real Estate Properties [Line Items]
Investment in unconsolidated Affiliates	66.67%		66.67%
Area (Others)	75,000		75,000
Grand Forks INREIT, LLC [Member] \| Market Place Investors, LLC [Member]
Real Estate Properties [Line Items]
Percentage of interest	50.00%		50.00%
Grand Forks INREIT, LLC [Member] \| Operating Partnership [Member]
Real Estate Properties [Line Items]
Percentage of interest	100.00%		100.00%
Grand Forks INREIT, LLC [Member] \| Grand Forks Marketplace Retail Center [Member]
Real Estate Properties [Line Items]
Percentage of interest	33.30%		33.30%
Grand Forks INREIT, LLC [Member] \| Retail Center [Member]
Real Estate Properties [Line Items]
Percentage of interest	33.30%		33.30%