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Schedule III (Real Estate and Accumulated Depreciation and Amortization) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Real Estate And Accumulated Depreciation [Line Items]      
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 151,142,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 37,917,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 202,335,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total 240,252,000    
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements 32,369,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 37,951,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 186,389,000    
SEC Schedule III, Real Estate, Gross, Total 256,709,000    
Real Estate Accumulated Depreciation & Depreciation 43,567,809 [1] $ 40,012,255 $ 36,311,485
Mortgage Loans on Real Estate, Write-down or Reserve, Amount 2,033,000    
SEC Schedule III, Real Estate Investment Property, Net, Total 211,108,000    
Office/Industrial Properties [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 101,388,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 23,622,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 136,996,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total 160,618,000    
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements 29,825,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 23,622,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 122,147,000    
SEC Schedule III, Real Estate, Gross, Total 175,594,000    
Real Estate Accumulated Depreciation & Depreciation [1] 36,399,000    
Mortgage Loans on Real Estate, Write-down or Reserve, Amount 500,000    
SEC Schedule III, Real Estate Investment Property, Net, Total 138,695,000    
Office/Industrial Properties [Member] | Garden Gateway Plaza [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 6,271,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 3,035,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 12,091,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total 15,126,000    
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements 2,721,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,035,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,833,000    
SEC Schedule III, Real Estate, Gross, Total 16,589,000    
Real Estate Accumulated Depreciation & Depreciation [1] 5,423,000    
SEC Schedule III, Real Estate Investment Property, Net, Total $ 11,166,000    
Real Estate And Accumulated Depreciation Date Acquired 03/07    
Office/Industrial Properties [Member] | Garden Gateway Plaza [Member] | Minimum [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
Real Estate And Accumulated Depreciation Year Built Or Renovated 1982    
Office/Industrial Properties [Member] | Garden Gateway Plaza [Member] | Maximum [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
Real Estate And Accumulated Depreciation Year Built Or Renovated 2006    
Office/Industrial Properties [Member] | Executive Office Park [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 4,948,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 1,266,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 8,815,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total 10,081,000    
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements 1,490,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,266,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,880,000    
SEC Schedule III, Real Estate, Gross, Total 10,636,000    
Real Estate Accumulated Depreciation & Depreciation [1] 2,660,000    
SEC Schedule III, Real Estate Investment Property, Net, Total $ 7,976,000    
Real Estate And Accumulated Depreciation Date Acquired 07/08    
Real Estate And Accumulated Depreciation Year Built Or Renovated 2000    
Office/Industrial Properties [Member] | Morena Office Center [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances [2] $ 1,567,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land [2] 1,333,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements [2] 5,203,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total [2] 6,536,000    
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements [2] 787,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land [2] 1,333,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements [2] 5,037,000    
SEC Schedule III, Real Estate, Gross, Total [2] 7,157,000    
Real Estate Accumulated Depreciation & Depreciation [1],[2] 1,941,000    
Mortgage Loans on Real Estate, Write-down or Reserve, Amount [2] 500,000    
SEC Schedule III, Real Estate Investment Property, Net, Total [2] $ 4,716,000    
Real Estate And Accumulated Depreciation Date Acquired [2] 01/09    
Real Estate And Accumulated Depreciation Year Built Or Renovated [2] 1985    
Office/Industrial Properties [Member] | Genesis Plaza [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 6,476,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 1,400,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 8,600,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total 10,000,000    
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements 1,712,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,400,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,007,000    
SEC Schedule III, Real Estate, Gross, Total 11,119,000    
Real Estate Accumulated Depreciation & Depreciation [1] 2,670,000    
SEC Schedule III, Real Estate Investment Property, Net, Total $ 8,449,000    
Real Estate And Accumulated Depreciation Date Acquired 08/10    
Real Estate And Accumulated Depreciation Year Built Or Renovated 1989    
Office/Industrial Properties [Member] | Dakota Center [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 10,315,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 832,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 8,743,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total 9,575,000    
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements 1,267,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 832,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 9,823,000    
SEC Schedule III, Real Estate, Gross, Total 11,922,000    
Real Estate Accumulated Depreciation & Depreciation [1] 2,783,000    
SEC Schedule III, Real Estate Investment Property, Net, Total $ 9,139,000    
Real Estate And Accumulated Depreciation Date Acquired 05/11    
Real Estate And Accumulated Depreciation Year Built Or Renovated 1982    
Office/Industrial Properties [Member] | The Presidio [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 5,993,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 1,325,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 5,950,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total 7,275,000    
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements 1,962,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,325,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,320,000    
SEC Schedule III, Real Estate, Gross, Total 8,607,000    
Real Estate Accumulated Depreciation & Depreciation [1] 2,108,000    
SEC Schedule III, Real Estate Investment Property, Net, Total $ 6,499,000    
Real Estate And Accumulated Depreciation Date Acquired 11/12    
Real Estate And Accumulated Depreciation Year Built Or Renovated 1985    
Office/Industrial Properties [Member] | Grand Pacific Center [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 3,961,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 413,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,926,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total 5,339,000    
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements 714,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 413,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,921,000    
SEC Schedule III, Real Estate, Gross, Total 7,048,000    
Real Estate Accumulated Depreciation & Depreciation [1] 1,234,000    
SEC Schedule III, Real Estate Investment Property, Net, Total $ 5,814,000    
Real Estate And Accumulated Depreciation Date Acquired 03/14    
Real Estate And Accumulated Depreciation Year Built Or Renovated 1976    
Office/Industrial Properties [Member] | Union Terrace [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 6,354,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 1,717,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 7,708,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total 9,425,000    
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements 3,246,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,717,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 5,749,000    
SEC Schedule III, Real Estate, Gross, Total 10,712,000    
Real Estate Accumulated Depreciation & Depreciation [1] 2,729,000    
SEC Schedule III, Real Estate Investment Property, Net, Total $ 7,983,000    
Real Estate And Accumulated Depreciation Date Acquired 08/14    
Real Estate And Accumulated Depreciation Year Built Or Renovated 1982    
Office/Industrial Properties [Member] | Centennial Tech Center [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 9,746,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 2,025,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 13,475,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total 15,500,000    
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements 3,250,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,025,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,545,000    
SEC Schedule III, Real Estate, Gross, Total 15,820,000    
Real Estate Accumulated Depreciation & Depreciation [1] 2,860,000    
SEC Schedule III, Real Estate Investment Property, Net, Total $ 12,960,000    
Real Estate And Accumulated Depreciation Date Acquired 12/14    
Real Estate And Accumulated Depreciation Year Built Or Renovated 1999    
Office/Industrial Properties [Member] | Arapahoe Center [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 8,234,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 1,420,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 10,430,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total 11,850,000    
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements 2,076,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,420,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,844,000    
SEC Schedule III, Real Estate, Gross, Total 12,340,000    
Real Estate Accumulated Depreciation & Depreciation [1] 2,089,000    
SEC Schedule III, Real Estate Investment Property, Net, Total $ 10,251,000    
Real Estate And Accumulated Depreciation Date Acquired 12/14    
Real Estate And Accumulated Depreciation Year Built Or Renovated 2000    
Office/Industrial Properties [Member] | West Fargo Industrial [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 4,293,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 1,693,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,207,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total 7,900,000    
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements 352,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,693,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,052,000    
SEC Schedule III, Real Estate, Gross, Total 8,097,000    
Real Estate Accumulated Depreciation & Depreciation [1] 854,000    
SEC Schedule III, Real Estate Investment Property, Net, Total $ 7,243,000    
Real Estate And Accumulated Depreciation Date Acquired 08/15    
Office/Industrial Properties [Member] | West Fargo Industrial [Member] | Minimum [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
Real Estate And Accumulated Depreciation Year Built Or Renovated 1998    
Office/Industrial Properties [Member] | West Fargo Industrial [Member] | Maximum [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
Real Estate And Accumulated Depreciation Year Built Or Renovated 2005    
Office/Industrial Properties [Member] | 300 N.P. [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 2,348,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 135,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 3,715,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total 3,850,000    
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements 317,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 135,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 3,589,000    
SEC Schedule III, Real Estate, Gross, Total 4,041,000    
Real Estate Accumulated Depreciation & Depreciation [1] 498,000    
SEC Schedule III, Real Estate Investment Property, Net, Total $ 3,543,000    
Real Estate And Accumulated Depreciation Date Acquired 08/15    
Real Estate And Accumulated Depreciation Year Built Or Renovated 1922    
Office/Industrial Properties [Member] | Highland Court [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 6,568,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 3,608,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 9,442,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total 13,050,000    
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements 3,093,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,608,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,756,000    
SEC Schedule III, Real Estate, Gross, Total 14,457,000    
Real Estate Accumulated Depreciation & Depreciation [1] 2,612,000    
SEC Schedule III, Real Estate Investment Property, Net, Total $ 11,845,000    
Real Estate And Accumulated Depreciation Date Acquired 08/15    
Real Estate And Accumulated Depreciation Year Built Or Renovated 1984    
Office/Industrial Properties [Member] | One Park Centre [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 6,586,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 1,206,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 7,944,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total 9,150,000    
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements 1,389,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,206,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,366,000    
SEC Schedule III, Real Estate, Gross, Total 9,961,000    
Real Estate Accumulated Depreciation & Depreciation [1] 1,508,000    
SEC Schedule III, Real Estate Investment Property, Net, Total $ 8,453,000    
Real Estate And Accumulated Depreciation Date Acquired 08/15    
Real Estate And Accumulated Depreciation Year Built Or Renovated 1983    
Office/Industrial Properties [Member] | Shea Center II [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 17,728,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 2,214,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 23,747,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total 25,961,000    
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements 5,449,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,214,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 19,425,000    
SEC Schedule III, Real Estate, Gross, Total 27,088,000    
Real Estate Accumulated Depreciation & Depreciation [1] 4,430,000    
SEC Schedule III, Real Estate Investment Property, Net, Total $ 22,658,000    
Real Estate And Accumulated Depreciation Date Acquired 12/15    
Real Estate And Accumulated Depreciation Year Built Or Renovated 2000    
Retail Properties [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 17,025,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 6,206,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 22,950,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total 29,156,000    
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements 2,544,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 6,239,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 21,853,000    
SEC Schedule III, Real Estate, Gross, Total 30,636,000    
Real Estate Accumulated Depreciation & Depreciation [1] 5,453,000    
Mortgage Loans on Real Estate, Write-down or Reserve, Amount 1,533,000    
SEC Schedule III, Real Estate Investment Property, Net, Total 23,650,000    
Retail Properties [Member] | World Plaza [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 3,351,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 1,698,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,232,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total 7,930,000    
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements 1,116,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,698,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,263,000    
SEC Schedule III, Real Estate, Gross, Total 9,077,000    
Real Estate Accumulated Depreciation & Depreciation [1] 2,197,000    
Mortgage Loans on Real Estate, Write-down or Reserve, Amount 700,000    
SEC Schedule III, Real Estate Investment Property, Net, Total $ 6,180,000    
Real Estate And Accumulated Depreciation Date Acquired 09/07    
Real Estate And Accumulated Depreciation Year Built Or Renovated 1974    
Retail Properties [Member] | Waterman Plaza [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 3,370,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 2,350,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 4,814,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total 7,164,000    
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements 556,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,383,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,324,000    
SEC Schedule III, Real Estate, Gross, Total 7,263,000    
Real Estate Accumulated Depreciation & Depreciation [1] 1,453,000    
Mortgage Loans on Real Estate, Write-down or Reserve, Amount 833,000    
SEC Schedule III, Real Estate Investment Property, Net, Total $ 4,977,000    
Real Estate And Accumulated Depreciation Date Acquired 08/08    
Real Estate And Accumulated Depreciation Year Built Or Renovated 2008    
Retail Properties [Member] | Union Town Center [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 8,440,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 1,750,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 9,462,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total 11,212,000    
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements 713,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,750,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,917,000    
SEC Schedule III, Real Estate, Gross, Total 11,380,000    
Real Estate Accumulated Depreciation & Depreciation [1] 1,476,000    
SEC Schedule III, Real Estate Investment Property, Net, Total $ 9,904,000    
Real Estate And Accumulated Depreciation Date Acquired 12/14    
Real Estate And Accumulated Depreciation Year Built Or Renovated 2003    
Retail Properties [Member] | Research Parkway [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 1,864,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 408,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,442,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total 2,850,000    
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements 159,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 408,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,349,000    
SEC Schedule III, Real Estate, Gross, Total 2,916,000    
Real Estate Accumulated Depreciation & Depreciation [1] 327,000    
SEC Schedule III, Real Estate Investment Property, Net, Total $ 2,589,000    
Real Estate And Accumulated Depreciation Date Acquired 8/15/2016    
Real Estate And Accumulated Depreciation Year Built Or Renovated 2003    
Model Home [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 32,729,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 8,089,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 42,389,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total 50,478,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 8,090,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 42,389,000    
SEC Schedule III, Real Estate, Gross, Total 50,479,000    
Real Estate Accumulated Depreciation & Depreciation [1] 1,716,000    
SEC Schedule III, Real Estate Investment Property, Net, Total 48,763,000    
Model Home [Member] | NetREIT Dubose Model Home REIT, Inc. [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 4,809,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 1,387,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 7,019,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total 8,406,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,387,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,020,000    
SEC Schedule III, Real Estate, Gross, Total 8,407,000    
Real Estate Accumulated Depreciation & Depreciation [1] 459,000    
SEC Schedule III, Real Estate Investment Property, Net, Total $ 7,948,000    
Real Estate And Accumulated Depreciation Date Acquired 2010-2016    
Model Home [Member] | NetREIT Dubose Model Home REIT, Inc. [Member] | Minimum [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
Real Estate And Accumulated Depreciation Year Built Or Renovated 2010    
Model Home [Member] | NetREIT Dubose Model Home REIT, Inc. [Member] | Maximum [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
Real Estate And Accumulated Depreciation Year Built Or Renovated 2016    
Model Home [Member] | Dubose Model Home Investors 201 L.P. [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 5,748,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 1,384,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 7,381,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total 8,765,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,385,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,381,000    
SEC Schedule III, Real Estate, Gross, Total 8,766,000    
Real Estate Accumulated Depreciation & Depreciation [1] 268,000    
SEC Schedule III, Real Estate Investment Property, Net, Total $ 8,498,000    
Real Estate And Accumulated Depreciation Date Acquired 2014-2018    
Model Home [Member] | Dubose Model Home Investors 201 L.P. [Member] | Minimum [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
Real Estate And Accumulated Depreciation Year Built Or Renovated 2014    
Model Home [Member] | Dubose Model Home Investors 201 L.P. [Member] | Maximum [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
Real Estate And Accumulated Depreciation Year Built Or Renovated 2018    
Model Home [Member] | Dubose Model Home Investors 202, L.P. [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 7,959,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 1,911,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 10,220,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total 12,131,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,911,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,220,000    
SEC Schedule III, Real Estate, Gross, Total 12,131,000    
Real Estate Accumulated Depreciation & Depreciation [1] 472,000    
SEC Schedule III, Real Estate Investment Property, Net, Total $ 11,659,000    
Real Estate And Accumulated Depreciation Date Acquired 2016-2018    
Model Home [Member] | Dubose Model Home Investors 202, L.P. [Member] | Minimum [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
Real Estate And Accumulated Depreciation Year Built Or Renovated 2016    
Model Home [Member] | Dubose Model Home Investors 202, L.P. [Member] | Maximum [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
Real Estate And Accumulated Depreciation Year Built Or Renovated 2018    
Model Home [Member] | Dubose Model Home Investors 204, L.P. [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 5,449,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 1,409,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,522,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total 7,931,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,409,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 6,521,000    
SEC Schedule III, Real Estate, Gross, Total 7,930,000    
Real Estate Accumulated Depreciation & Depreciation [1] 94,000    
SEC Schedule III, Real Estate Investment Property, Net, Total $ 7,836,000    
Real Estate And Accumulated Depreciation Date Acquired 2018    
Real Estate And Accumulated Depreciation Year Built Or Renovated 2018    
Model Home [Member] | NetREIT Model Homes LLC [Member]      
Real Estate And Accumulated Depreciation [Line Items]      
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 8,764,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land 1,998,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 11,247,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total 13,245,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,998,000    
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 11,247,000    
SEC Schedule III, Real Estate, Gross, Total 13,245,000    
Real Estate Accumulated Depreciation & Depreciation [1] 423,000    
SEC Schedule III, Real Estate Investment Property, Net, Total $ 12,822,000    
Real Estate And Accumulated Depreciation Date Acquired 2016    
Real Estate And Accumulated Depreciation Year Built Or Renovated 2016    
[1] Depreciation is computed on a straight-line basis using useful lives up to 39 years.
[2] Property held for sale as of December 31, 2018 and sold for $5.6 million on January 15, 2019.