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Schedule III - Real Estate and Accumulated Depreciation and Amortization - Properties (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Encumbrances $ 89,422,000    
Land, Initial Cost 22,995,000    
Building and Improvements, Initial Cost 132,151,000    
Acquisition Price 155,146,000    
Capitalized Improvements 16,876,000    
Land Cost, Total Cost 22,995,000    
Building & Improvements, Total Cost 149,028,000    
Total cost 172,022,000    
Accumulated Depreciation & Depreciation 32,948,757 [1] $ 42,387,199 $ 44,113,962
Reserve for Impairment 1,008,000    
NBV Real Estate 138,065,000    
Industrial Office Properties [Member]      
Encumbrances 57,389,000    
Land, Initial Cost 11,981,000    
Building and Improvements, Initial Cost 80,536,000    
Acquisition Price 92,517,000    
Capitalized Improvements 12,556,000    
Land Cost, Total Cost 11,981,000    
Building & Improvements, Total Cost 93,092,000    
Total cost 105,073,000    
Accumulated Depreciation & Depreciation [1] 26,482,000    
Reserve for Impairment 308,000    
NBV Real Estate 78,283,000    
Industrial Office Properties [Member] | Genesis Plaza [Member]      
Encumbrances 6,169,000    
Land, Initial Cost 1,400,000    
Building and Improvements, Initial Cost 8,600,000    
Acquisition Price 10,000,000    
Capitalized Improvements 2,661,000    
Land Cost, Total Cost 1,400,000    
Building & Improvements, Total Cost 11,261,000    
Total cost 12,661,000    
Accumulated Depreciation & Depreciation [1] 4,350,000    
Reserve for Impairment 0    
NBV Real Estate 8,311,000    
Industrial Office Properties [Member] | Dakota Center [Member]      
Encumbrances 9,677,000    
Land, Initial Cost 832,000    
Building and Improvements, Initial Cost 8,743,000    
Acquisition Price 9,575,000    
Capitalized Improvements 2,876,000    
Land Cost, Total Cost 832,000    
Building & Improvements, Total Cost 11,619,000    
Total cost 12,451,000    
Accumulated Depreciation & Depreciation [1] 3,844,000    
Reserve for Impairment 0    
NBV Real Estate 8,607,000    
Industrial Office Properties [Member] | Grand Pacific Center [Member]      
Encumbrances 3,620,000    
Land, Initial Cost 413,000    
Building and Improvements, Initial Cost 4,926,000    
Acquisition Price 5,339,000    
Capitalized Improvements 2,124,000    
Land Cost, Total Cost 413,000    
Building & Improvements, Total Cost 7,050,000    
Total cost 7,463,000    
Accumulated Depreciation & Depreciation [1] 2,006,000    
Reserve for Impairment 0    
NBV Real Estate 5,457,000    
Industrial Office Properties [Member] | Arapahoe Center [Member]      
Encumbrances 7,771,000    
Land, Initial Cost 1,420,000    
Building and Improvements, Initial Cost 10,430,000    
Acquisition Price 11,850,000    
Capitalized Improvements 592,000    
Land Cost, Total Cost 1,420,000    
Building & Improvements, Total Cost 11,022,000    
Total cost 12,442,000    
Accumulated Depreciation & Depreciation [1] 3,621,000    
Reserve for Impairment 0    
NBV Real Estate 8,821,000    
Industrial Office Properties [Member] | West Fargo Industrial [Member]      
Encumbrances 4,148,000    
Land, Initial Cost 1,693,000    
Building and Improvements, Initial Cost 6,207,000    
Acquisition Price 7,900,000    
Capitalized Improvements 351,000    
Land Cost, Total Cost 1,693,000    
Building & Improvements, Total Cost 6,558,000    
Total cost 8,251,000    
Accumulated Depreciation & Depreciation [1] 1,226,000    
Reserve for Impairment 0    
NBV Real Estate 7,025,000    
Industrial Office Properties [Member] | The 300 N.P [Member]      
Encumbrances 2,233,000    
Land, Initial Cost 135,000    
Building and Improvements, Initial Cost 3,715,000    
Acquisition Price 3,850,000    
Capitalized Improvements 273,000    
Land Cost, Total Cost 135,000    
Building & Improvements, Total Cost 3,988,000    
Total cost 4,123,000    
Accumulated Depreciation & Depreciation [1] 885,000    
Reserve for Impairment 308,000    
NBV Real Estate 2,930,000    
Industrial Office Properties [Member] | One Park Centre [Member]      
Encumbrances 6,277,000    
Land, Initial Cost 1,206,000    
Building and Improvements, Initial Cost 7,944,000    
Acquisition Price 9,150,000    
Capitalized Improvements 1,398,000    
Land Cost, Total Cost 1,206,000    
Building & Improvements, Total Cost 9,342,000    
Total cost 10,548,000    
Accumulated Depreciation & Depreciation [1] 2,555,000    
Reserve for Impairment 0    
NBV Real Estate 7,992,000    
Industrial Office Properties [Member] | Shea Center II [Member]      
Encumbrances 17,495,000    
Land, Initial Cost 2,214,000    
Building and Improvements, Initial Cost 23,747,000    
Acquisition Price 25,961,000    
Capitalized Improvements 2,281,000    
Land Cost, Total Cost 2,214,000    
Building & Improvements, Total Cost 26,028,000    
Total cost 28,241,000    
Accumulated Depreciation & Depreciation [1] 7,995,000    
Reserve for Impairment 0    
NBV Real Estate 20,247,000    
Industrial Office Properties [Member] | Baltimore [Member]      
Encumbrances 0    
Land, Initial Cost 2,668,000    
Building and Improvements, Initial Cost 6,224,000    
Acquisition Price 8,892,000    
Capitalized Improvements 0    
Land Cost, Total Cost 2,668,000    
Building & Improvements, Total Cost 6,224,000    
Total cost 8,892,000    
Accumulated Depreciation & Depreciation 0    
Reserve for Impairment    
NBV Real Estate 8,892,000    
Industrial Office Properties [Member] | Mandolin [Member]      
Total cost 4,906,000    
Retail Properties [Member]      
Encumbrances 9,879,000    
Land, Initial Cost 5,186,000    
Building and Improvements, Initial Cost 21,698,000    
Acquisition Price 26,884,000    
Capitalized Improvements 4,320,000    
Land Cost, Total Cost 5,186,000    
Building & Improvements, Total Cost 26,018,000    
Total cost 31,203,000    
Accumulated Depreciation & Depreciation [1] 4,810,000    
Reserve for Impairment 700,000    
NBV Real Estate 25,693,000    
Retail Properties [Member] | World Plaza [Member]      
Encumbrances [2] 0    
Land, Initial Cost [2] 1,698,000    
Building and Improvements, Initial Cost [2] 6,232,000    
Acquisition Price [2] 7,930,000    
Capitalized Improvements [2] 4,289,000    
Land Cost, Total Cost [2] 1,698,000    
Building & Improvements, Total Cost [2] 10,521,000    
Total cost [2] 12,219,000    
Accumulated Depreciation & Depreciation [1],[2] 2,246,000    
Reserve for Impairment [2] 700,000    
NBV Real Estate [2] 9,272,000    
Retail Properties [Member] | Union Town Center [Member]      
Encumbrances 8,174,000    
Land, Initial Cost 1,750,000    
Building and Improvements, Initial Cost 9,462,000    
Acquisition Price 11,212,000    
Capitalized Improvements 67,000    
Land Cost, Total Cost 1,750,000    
Building & Improvements, Total Cost 9,529,000    
Total cost 11,279,000    
Accumulated Depreciation & Depreciation [1] 2,110,000    
Reserve for Impairment 0    
NBV Real Estate 9,169,000    
Retail Properties [Member] | Research Parkway [Member]      
Encumbrances 1,705,000    
Land, Initial Cost 408,000    
Building and Improvements, Initial Cost 2,442,000    
Acquisition Price 2,850,000    
Capitalized Improvements (50,000)    
Land Cost, Total Cost 408,000    
Building & Improvements, Total Cost 2,392,000    
Total cost 2,799,000    
Accumulated Depreciation & Depreciation [1] 424,000    
Reserve for Impairment 0    
NBV Real Estate 2,376,000    
Retail Properties [Member] | Mandolin [Member]      
Encumbrances 0    
Land, Initial Cost 1,330,000    
Building and Improvements, Initial Cost 3,562,000    
Acquisition Price 4,892,000    
Capitalized Improvements 15,000    
Land Cost, Total Cost 1,330,000    
Building & Improvements, Total Cost 3,577,000    
Accumulated Depreciation & Depreciation 31,000    
Reserve for Impairment 0    
NBV Real Estate 4,876,000    
Model Home [Member]      
Encumbrances 22,154,000    
Land, Initial Cost 5,828,000    
Building and Improvements, Initial Cost 29,917,000    
Acquisition Price 35,746,000    
Land Cost, Total Cost 5,828,000    
Building & Improvements, Total Cost 29,917,000    
Total cost 35,746,000    
Accumulated Depreciation & Depreciation [1] 1,657,000    
NBV Real Estate 34,089,000    
Model Home [Member] | Model Homes-DMH LP #202 [Member]      
Encumbrances 822,000    
Land, Initial Cost 235,000    
Building and Improvements, Initial Cost 1,435,000    
Acquisition Price 1,670,000    
Land Cost, Total Cost 235,000    
Building & Improvements, Total Cost 1,435,000    
Total cost 1,670,000    
Accumulated Depreciation & Depreciation [1] 141,000    
NBV Real Estate 1,529,000    
Model Home [Member] | Model Homes-DMH LP #203 [Member]      
Encumbrances 3,273,000    
Land, Initial Cost 1,080,000    
Building and Improvements, Initial Cost 4,697,000    
Acquisition Price 5,777,000    
Land Cost, Total Cost 1,080,000    
Building & Improvements, Total Cost 4,697,000    
Total cost 5,777,000    
Accumulated Depreciation & Depreciation [1] 412,000    
NBV Real Estate 5,365,000    
Model Home [Member] | Model Homes-DMH LP #204 [Member]      
Encumbrances 2,810,000    
Land, Initial Cost 980,000    
Building and Improvements, Initial Cost 4,903,000    
Acquisition Price 5,883,000    
Land Cost, Total Cost 980,000    
Building & Improvements, Total Cost 4,903,000    
Total cost 5,883,000    
Accumulated Depreciation & Depreciation [1] 361,000    
NBV Real Estate 5,522,000    
Model Home [Member] | Model Homes-DMH LP #205 [Member]      
Encumbrances 4,207,000    
Land, Initial Cost 1,260,000    
Building and Improvements, Initial Cost 5,223,000    
Acquisition Price 6,482,000    
Land Cost, Total Cost 1,260,000    
Building & Improvements, Total Cost 5,223,000    
Total cost 6,482,000    
Accumulated Depreciation & Depreciation [1] 280,000    
NBV Real Estate 6,202,000    
Model Home [Member] | Model Homes-DMH LP #206 [Member]      
Encumbrances 2,097,000    
Land, Initial Cost 392,000    
Building and Improvements, Initial Cost 2,740,000    
Acquisition Price 3,132,000    
Land Cost, Total Cost 392,000    
Building & Improvements, Total Cost 2,740,000    
Total cost 3,132,000    
Accumulated Depreciation & Depreciation [1] 75,000    
NBV Real Estate 3,057,000    
Model Home [Member] | Model Homes-NMH Inc. [Member]      
Encumbrances 8,945,000    
Land, Initial Cost 1,881,000    
Building and Improvements, Initial Cost 10,920,000    
Acquisition Price 12,801,000    
Land Cost, Total Cost 1,881,000    
Building & Improvements, Total Cost 10,920,000    
Total cost 12,801,000    
Accumulated Depreciation & Depreciation [1] 388,000    
NBV Real Estate $ 12,413,000    
[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, 2021.