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Subsequent Events (Details)
 1 Months Ended 6 Months Ended
Aug. 31, 2015
USD ($)
ft²
Properties
shares
Jun. 30, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
Subsequent Event [Line Items]      
Promissory note issued for property acquired [1]   $ 108,615,615 $ 106,966,774
Mandatorily Redeemable Preferred Stock [Member] | Series B Preferred Stock [Member]      
Subsequent Event [Line Items]      
Preferred stock shares issued (in shares) | shares   16,600  
Preferred shares issued (value)   $ 16,600,000  
Preferred Stock, Redemption Date   Nov. 01, 2015  
Subsequent Event [Member] | Mandatorily Redeemable Preferred Stock [Member] | Series B Preferred Stock [Member]      
Subsequent Event [Line Items]      
Preferred stock shares issued (in shares) | shares 13,400    
Preferred shares issued (value) $ 13,266,000    
Payments Of Stock Issuance Costs $ 134,000    
Preferred stock shares outstanding (in shares) | shares 10,000    
Preferred Stock, Redemption Date Nov. 01, 2015    
Subsequent Event [Member] | West Fargo Industrial Office Buildings [Member]      
Subsequent Event [Line Items]      
Business Acquisition Effective Date Of Acquisition Aug. 01, 2015    
Business Combination, Purchase Price $ 7,900,000    
Number of properties | Properties 1    
Number Of Units In Real Estate Property | Properties 7    
Rentable Area | ft² 152,154    
Geographic Location Of Property Fargo, North Dakota    
Cash paid to acquire entity $ 3,400,000    
Subsequent Event [Member] | West Fargo Industrial Office Buildings [Member] | West Fargo Industrial Building Mortgage Note Due August 2020 [Member]      
Subsequent Event [Line Items]      
Promissory note issued for property acquired $ 4,500,000    
Subsequent Event [Member] | 300 NP Office Building [Member]      
Subsequent Event [Line Items]      
Business Acquisition Effective Date Of Acquisition Aug. 01, 2015    
Business Combination, Purchase Price $ 3,900,000    
Number of properties | Properties 1    
Number Of Units In Real Estate Property | Properties 1    
Rentable Area | ft² 34,056    
Geographic Location Of Property Fargo, North Dakota    
Cash paid to acquire entity $ 3,900,000    
Subsequent Event [Member] | Three Properties in Colorado [Member]      
Subsequent Event [Line Items]      
Business Combination, Purchase Price $ 22,000,000    
Geographic Location Of Property Colorado    
Expected Closing Date of Acquisition From July 1, 2015 to September 31, 2015    
[1] Each Model Home has a standalone mortgage note at interest rates ranging from 4.9% to 5.8% (at June 30, 2015).