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Schedule III - Real Estate and Accumulated Depreciation and Amortization - Properties (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Encumbrances $ 120,788,000    
Land, Initial Cost 30,297,000    
Building and Improvements, Initial Cost 164,472,000    
Acquisition Price 195,452,000    
Capitalized Improvements 26,279,000    
Land Cost, Total Cost 30,330,000    
Building & Improvements, Total Cost 155,296,000    
Total cost 211,905,000    
Accumulated Depreciation & Depreciation 42,387,199 [1] $ 44,113,962 $ 43,567,809
Reserve for Impairment 3,264,000    
NBV Real Estate 166,254,000    
Industrial Office Properties [Member]      
Encumbrances 73,618,000    
Land, Initial Cost 16,539,000    
Building and Improvements, Initial Cost 104,660,000    
Acquisition Price 121,882,000    
Capitalized Improvements 23,723,000    
Land Cost, Total Cost 16,539,000    
Building & Improvements, Total Cost 94,071,000    
Total cost 134,333,000    
Accumulated Depreciation & Depreciation [1] 34,743,000    
Reserve for Impairment 400,000    
NBV Real Estate 99,190,000    
Industrial Office Properties [Member] | Garden Gateway [Member]      
Encumbrances [2],[3] 5,861,000    
Land, Initial Cost [2],[3] 3,035,000    
Building and Improvements, Initial Cost [2],[3] 12,091,000    
Acquisition Price [2],[3] 15,126,000    
Capitalized Improvements [2],[3] 3,329,000    
Land Cost, Total Cost [2],[3] 3,035,000    
Building & Improvements, Total Cost [2],[3] 10,874,000    
Total cost [2],[3] 17,238,000    
Accumulated Depreciation & Depreciation [1],[2],[3] 5,774,000    
Reserve for Impairment [2],[3] 0    
NBV Real Estate [2],[3] 11,464,000    
Industrial Office Properties [Member] | Executive Park [Member]      
Encumbrances 2,986,000    
Land, Initial Cost 583,000    
Building and Improvements, Initial Cost 8,815,000    
Acquisition Price 10,081,000    
Capitalized Improvements 1,473,000    
Land Cost, Total Cost 583,000    
Building & Improvements, Total Cost 5,561,000    
Total cost 7,617,000    
Accumulated Depreciation & Depreciation [1] 2,510,000    
Reserve for Impairment 0    
NBV Real Estate 5,107,000    
Industrial Office Properties [Member] | Genesis Plaza [Member]      
Encumbrances 6,276,000    
Land, Initial Cost 1,400,000    
Building and Improvements, Initial Cost 8,600,000    
Acquisition Price 10,000,000    
Capitalized Improvements 2,625,000    
Land Cost, Total Cost 1,400,000    
Building & Improvements, Total Cost 8,323,000    
Total cost 12,348,000    
Accumulated Depreciation & Depreciation [1] 3,697,000    
Reserve for Impairment 0    
NBV Real Estate 8,651,000    
Industrial Office Properties [Member] | Dakota Center [Member]      
Encumbrances 9,900,000    
Land, Initial Cost 832,000    
Building and Improvements, Initial Cost 8,743,000    
Acquisition Price 9,575,000    
Capitalized Improvements 1,306,000    
Land Cost, Total Cost 832,000    
Building & Improvements, Total Cost 9,960,000    
Total cost 12,098,000    
Accumulated Depreciation & Depreciation [1] 3,500,000    
Reserve for Impairment 0    
NBV Real Estate 8,598,000    
Industrial Office Properties [Member] | Grand Pacific Center [Member]      
Encumbrances 3,738,000    
Land, Initial Cost 413,000    
Building and Improvements, Initial Cost 4,926,000    
Acquisition Price 5,339,000    
Capitalized Improvements 904,000    
Land Cost, Total Cost 413,000    
Building & Improvements, Total Cost 6,099,000    
Total cost 7,416,000    
Accumulated Depreciation & Depreciation [1] 1,732,000    
Reserve for Impairment 0    
NBV Real Estate 5,684,000    
Industrial Office Properties [Member] | Arapahoe Center [Member]      
Encumbrances 7,932,000    
Land, Initial Cost 1,420,000    
Building and Improvements, Initial Cost 10,430,000    
Acquisition Price 11,850,000    
Capitalized Improvements 2,078,000    
Land Cost, Total Cost 1,420,000    
Building & Improvements, Total Cost 8,857,000    
Total cost 12,355,000    
Accumulated Depreciation & Depreciation [1] 3,122,000    
Reserve for Impairment 0    
NBV Real Estate 9,233,000    
Industrial Office Properties [Member] | West Fargo Industrial [Member]      
Encumbrances 4,263,000    
Land, Initial Cost 1,693,000    
Building and Improvements, Initial Cost 6,207,000    
Acquisition Price 7,900,000    
Capitalized Improvements 264,000    
Land Cost, Total Cost 1,693,000    
Building & Improvements, Total Cost 6,099,000    
Total cost 8,056,000    
Accumulated Depreciation & Depreciation [1] 995,000    
Reserve for Impairment 0    
NBV Real Estate 7,061,000    
Industrial Office Properties [Member] | The 300 N.P [Member]      
Encumbrances 2,274,000    
Land, Initial Cost 135,000    
Building and Improvements, Initial Cost 3,715,000    
Acquisition Price 3,850,000    
Capitalized Improvements 319,000    
Land Cost, Total Cost 135,000    
Building & Improvements, Total Cost 3,589,000    
Total cost 4,043,000    
Accumulated Depreciation & Depreciation [1] 764,000    
Reserve for Impairment 0    
NBV Real Estate 3,279,000    
Industrial Office Properties [Member] | Highland Court [Member]      
Encumbrances 6,275,000    
Land, Initial Cost 3,608,000    
Building and Improvements, Initial Cost 9,442,000    
Acquisition Price 13,050,000    
Capitalized Improvements 3,408,000    
Land Cost, Total Cost 3,608,000    
Building & Improvements, Total Cost 7,767,000    
Total cost 14,783,000    
Accumulated Depreciation & Depreciation [1] 3,883,000    
Reserve for Impairment 400,000    
NBV Real Estate 10,500,000    
Industrial Office Properties [Member] | One Park Centre [Member]      
Encumbrances 6,385,000    
Land, Initial Cost 1,206,000    
Building and Improvements, Initial Cost 7,944,000    
Acquisition Price 9,150,000    
Capitalized Improvements 1,952,000    
Land Cost, Total Cost 1,206,000    
Building & Improvements, Total Cost 7,416,000    
Total cost 10,574,000    
Accumulated Depreciation & Depreciation [1] 1,987,000    
Reserve for Impairment 0    
NBV Real Estate 8,587,000    
Industrial Office Properties [Member] | Shea Center II [Member]      
Encumbrances 17,728,000    
Land, Initial Cost 2,214,000    
Building and Improvements, Initial Cost 23,747,000    
Acquisition Price 25,961,000    
Capitalized Improvements 6,065,000    
Land Cost, Total Cost 2,214,000    
Building & Improvements, Total Cost 19,526,000    
Total cost 27,805,000    
Accumulated Depreciation & Depreciation [1] 6,779,000    
Reserve for Impairment 0    
NBV Real Estate 21,026,000    
Retail Properties [Member]      
Encumbrances 19,087,000    
Land, Initial Cost 6,206,000    
Building and Improvements, Initial Cost 22,950,000    
Acquisition Price 29,156,000    
Capitalized Improvements 2,556,000    
Land Cost, Total Cost 6,239,000    
Building & Improvements, Total Cost 24,363,000    
Total cost 33,158,000    
Accumulated Depreciation & Depreciation [1] 5,740,000    
Reserve for Impairment 2,864,000    
NBV Real Estate 24,554,000    
Retail Properties [Member] | World Plaza [Member]      
Encumbrances [3] 5,803,000    
Land, Initial Cost [3] 1,698,000    
Building and Improvements, Initial Cost [3] 6,232,000    
Acquisition Price [3] 7,930,000    
Capitalized Improvements [3] 1,761,000    
Land Cost, Total Cost [3] 1,698,000    
Building & Improvements, Total Cost [3] 8,758,000    
Total cost [3] 12,217,000    
Accumulated Depreciation & Depreciation [1],[3] 2,246,000    
Reserve for Impairment [3] 700,000    
NBV Real Estate [3] 9,271,000    
Retail Properties [Member] | Waterman Plaza [Member]      
Encumbrances [4] 3,208,000    
Land, Initial Cost [4] 2,350,000    
Building and Improvements, Initial Cost [4] 4,814,000    
Acquisition Price [4] 7,164,000    
Capitalized Improvements [4] 239,000    
Land Cost, Total Cost [4] 2,383,000    
Building & Improvements, Total Cost [4] 4,324,000    
Total cost [4] 6,946,000    
Accumulated Depreciation & Depreciation [1],[4] 1,282,000    
Reserve for Impairment [4] 2,164,000    
NBV Real Estate [4] 3,500,000    
Retail Properties [Member] | Union Town Center [Member]      
Encumbrances 8,316,000    
Land, Initial Cost 1,750,000    
Building and Improvements, Initial Cost 9,462,000    
Acquisition Price 11,212,000    
Capitalized Improvements 513,000    
Land Cost, Total Cost 1,750,000    
Building & Improvements, Total Cost 8,932,000    
Total cost 11,195,000    
Accumulated Depreciation & Depreciation [1] 1,851,000    
Reserve for Impairment 0    
NBV Real Estate 9,344,000    
Retail Properties [Member] | Research Parkway [Member]      
Encumbrances 1,760,000    
Land, Initial Cost 408,000    
Building and Improvements, Initial Cost 2,442,000    
Acquisition Price 2,850,000    
Capitalized Improvements 43,000    
Land Cost, Total Cost 408,000    
Building & Improvements, Total Cost 2,349,000    
Total cost 2,800,000    
Accumulated Depreciation & Depreciation [1] 361,000    
Reserve for Impairment 0    
NBV Real Estate 2,439,000    
Model Home [Member]      
Encumbrances 28,083,000    
Land, Initial Cost 7,552,000    
Building and Improvements, Initial Cost 36,862,000    
Acquisition Price 44,414,000    
Land Cost, Total Cost 7,552,000    
Building & Improvements, Total Cost 36,862,000    
Total cost 44,414,000    
Accumulated Depreciation & Depreciation [1] 1,904,000    
NBV Real Estate 42,510,000    
Model Home [Member] | Model Homes -NDMHR, LP [Member]      
Encumbrances 974,000    
Land, Initial Cost 534,000    
Building and Improvements, Initial Cost 2,047,000    
Acquisition Price 2,581,000    
Land Cost, Total Cost 534,000    
Building & Improvements, Total Cost 2,047,000    
Total cost 2,581,000    
Accumulated Depreciation & Depreciation [1] 197,000    
NBV Real Estate 2,384,000    
Model Home [Member] | Model Homes-DMH LP #202 [Member]      
Encumbrances 3,149,000    
Land, Initial Cost 741,000    
Building and Improvements, Initial Cost 4,238,000    
Acquisition Price 4,979,000    
Land Cost, Total Cost 741,000    
Building & Improvements, Total Cost 4,238,000    
Total cost 4,979,000    
Accumulated Depreciation & Depreciation [1] 337,000    
NBV Real Estate 4,642,000    
Model Home [Member] | Model Homes-DMH LP #203 [Member]      
Encumbrances 5,271,000    
Land, Initial Cost 1,600,000    
Building and Improvements, Initial Cost 7,132,000    
Acquisition Price 8,732,000    
Land Cost, Total Cost 1,600,000    
Building & Improvements, Total Cost 7,132,000    
Total cost 8,732,000    
Accumulated Depreciation & Depreciation [1] 441,000    
NBV Real Estate 8,291,000    
Model Home [Member] | Model Homes-DMH LP #204 [Member]      
Encumbrances 5,385,000    
Land, Initial Cost 1,412,000    
Building and Improvements, Initial Cost 6,787,000    
Acquisition Price 8,199,000    
Land Cost, Total Cost 1,412,000    
Building & Improvements, Total Cost 6,787,000    
Total cost 8,199,000    
Accumulated Depreciation & Depreciation [1] 345,000    
NBV Real Estate 7,854,000    
Model Home [Member] | Model Homes-DMH LP #205 [Member]      
Encumbrances 5,214,000    
Land, Initial Cost 1,461,000    
Building and Improvements, Initial Cost 6,287,000    
Acquisition Price 7,748,000    
Land Cost, Total Cost 1,461,000    
Building & Improvements, Total Cost 6,287,000    
Total cost 7,748,000    
Accumulated Depreciation & Depreciation [1] 179,000    
NBV Real Estate 7,569,000    
Model Home [Member] | Model Homes-DMH LP #206 [Member]      
Encumbrances 1,696,000    
Land, Initial Cost 294,000    
Building and Improvements, Initial Cost 2,181,000    
Acquisition Price 2,475,000    
Land Cost, Total Cost 294,000    
Building & Improvements, Total Cost 2,181,000    
Total cost 2,475,000    
Accumulated Depreciation & Depreciation [1] 27,000    
NBV Real Estate 2,448,000    
Model Home [Member] | Model Homes-NMH Inc. [Member]      
Encumbrances 6,394,000    
Land, Initial Cost 1,510,000    
Building and Improvements, Initial Cost 8,190,000    
Acquisition Price 9,700,000    
Land Cost, Total Cost 1,510,000    
Building & Improvements, Total Cost 8,190,000    
Total cost 9,700,000    
Accumulated Depreciation & Depreciation [1] 378,000    
NBV Real Estate $ 9,322,000    
[1] Depreciation is computed on a straight-line basis using useful lives up to 39 years.
[2] Garden Gateway sold for approximately $11.2 million on February 19, 2021.
[3] Property held for sale as of December 31, 2020.
[4] Waterman Plaza sold for approximately $3.5 million on January 28, 2021.