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Organization and Basis of Presentation (Details)
$ in Millions
 12 Months Ended
Aug. 01, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
Counterparty
Segment
Tenant
shares
Dec. 31, 2017
shares
Oct. 31, 2017
Property
Organization And Basis Of Presentation [Line Items]        
Number of property own that have partial interest | Property       1
Number of limited partnerships in which the company is sole General Partner | Counterparty   2    
Key provisions of operating or partnership agreement, description   The following partnership activity occurred during the periods covered by these consolidated financial statements:The Company is the sole General Partner in two consolidated limited partnerships (NetREIT Palm Self-Storage LP and NetREIT Casa Grande LP), all with ownership in real estate income producing properties. The Company refers to these entities collectively, as the “NetREIT Partnerships”.The Company is a limited partner in four partnerships and one limited liability corporation that purchase and leaseback model homes from developers (“Dubose Model Homes Investors #202, LP”, “Dubose Model Homes Investors #203, LP, “Dubose Model Homes Investors #204, LP, and “NetREIT Dubose Model Home REIT, LP”). The Company refers to these entities collectively, as the “Model Home Entities”. The Company has determined that the entities described above, where it owns less than 100%, should be included in the Company’s consolidated financial statements as the Company directs their activities and holds a non-controlling interest in these limited partnerships through the Company.    
Number of partnerships that purchase and leaseback model homes from developers in which the company is a limited partner | Counterparty   4    
Number of limited liability corporation that purchase and leaseback model homes from developers in which the company is a limited partner | Counterparty   1    
Mortgage notes payable | $   $ 9.9    
Mortgage notes payable maturing year   2019    
Number of reportable segments | Segment   3    
Customer Concentration Risk | Rental Income [Member]        
Organization And Basis Of Presentation [Line Items]        
Number of tenant | Tenant   1    
Concentration risk, percentage   5.70%    
Redeemable Convertible Preferred Stock Series B [Member]        
Organization And Basis Of Presentation [Line Items]        
Number of shares redeemed | shares   13,800 2,000  
Redeemable preferred stock | $   $ 16.9    
Redeemable Convertible Preferred Stock Series B [Member] | Scenario Forecast [Member]        
Organization And Basis Of Presentation [Line Items]        
Number of shares redeemed | shares 16,900      
Redeemable preferred stock | $ $ 16.9      
Partial Interest Properties        
Organization And Basis Of Presentation [Line Items]        
Number of commercial properties own in fee interest | Property       18