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Schedule III - Real Estate and Accumulated Depreciation and Amortization - Properties (Details) - USD ($)
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Encumbrances $ 97,752,000    
Land, Initial Cost 19,190,000    
Building and Improvements, Initial Cost 131,739,000    
Acquisition Price 150,930,000    
Capitalized Improvements 14,695,000    
Land Cost, Total Cost 19,190,000    
Building & Improvements, Total Cost 146,435,000    
Total cost 165,625,000    
Accumulated Depreciation & Depreciation 34,803,778 [1] $ 32,948,757 $ 42,387,199
Reserve for Impairment 308,000    
NBV Real Estate 130,513,000    
Industrial Office Properties [Member]      
Encumbrances 59,690,000    
Land, Initial Cost 9,528,000    
Building and Improvements, Initial Cost 82,989,000    
Acquisition Price 92,517,000    
Capitalized Improvements 14,551,000    
Land Cost, Total Cost 9,528,000    
Building & Improvements, Total Cost 97,539,000    
Total cost 107,067,000    
Accumulated Depreciation & Depreciation [1] 30,323,000    
Reserve for Impairment 308,000.0    
NBV Real Estate 76,436,000    
Industrial Office Properties [Member] | Genesis Plaza [Member]      
Encumbrances 6,056,000    
Land, Initial Cost 1,400,000    
Building and Improvements, Initial Cost 8,600,000    
Acquisition Price 10,000,000    
Capitalized Improvements 2,976,000    
Land Cost, Total Cost 1,400,000    
Building & Improvements, Total Cost 11,576,000    
Total cost 12,976,000    
Accumulated Depreciation & Depreciation [1] 4,980,000    
Reserve for Impairment 0    
NBV Real Estate 7,996,000    
Industrial Office Properties [Member] | Dakota Center [Member]      
Encumbrances 9,443,000    
Land, Initial Cost 832,000    
Building and Improvements, Initial Cost 8,743,000    
Acquisition Price 9,575,000    
Capitalized Improvements 3,199,000    
Land Cost, Total Cost 832,000    
Building & Improvements, Total Cost 11,942,000    
Total cost 12,774,000    
Accumulated Depreciation & Depreciation [1] 4,205,000    
Reserve for Impairment 0    
NBV Real Estate 8,570,000    
Industrial Office Properties [Member] | Grand Pacific Center [Member]      
Encumbrances 3,496,000    
Land, Initial Cost 413,000    
Building and Improvements, Initial Cost 4,926,000    
Acquisition Price 5,339,000    
Capitalized Improvements 2,165,000    
Land Cost, Total Cost 413,000    
Building & Improvements, Total Cost 7,091,000    
Total cost 7,504,000    
Accumulated Depreciation & Depreciation [1] 2,276,000    
Reserve for Impairment 0    
NBV Real Estate 5,228,000    
Industrial Office Properties [Member] | Arapahoe Center [Member]      
Encumbrances 7,602,000    
Land, Initial Cost 1,420,000    
Building and Improvements, Initial Cost 10,430,000    
Acquisition Price 11,850,000    
Capitalized Improvements 675,000    
Land Cost, Total Cost 1,420,000    
Building & Improvements, Total Cost 11,105,000    
Total cost 12,525,000    
Accumulated Depreciation & Depreciation [1] 3,860,000    
Reserve for Impairment 0    
NBV Real Estate 8,665,000    
Industrial Office Properties [Member] | West Fargo Industrial [Member]      
Encumbrances 4,030,000    
Land, Initial Cost 1,693,000    
Building and Improvements, Initial Cost 6,207,000    
Acquisition Price 7,900,000    
Capitalized Improvements 462,000    
Land Cost, Total Cost 1,693,000    
Building & Improvements, Total Cost 6,669,000    
Total cost 8,362,000    
Accumulated Depreciation & Depreciation [1] 1,469,000    
Reserve for Impairment 0    
NBV Real Estate 6,893,000    
Industrial Office Properties [Member] | The 300 N.P [Member]      
Encumbrances 0    
Land, Initial Cost 135,000    
Building and Improvements, Initial Cost 3,715,000    
Acquisition Price 3,850,000    
Capitalized Improvements 363,000    
Land Cost, Total Cost 135,000    
Building & Improvements, Total Cost 4,078,000    
Total cost 4,213,000    
Accumulated Depreciation & Depreciation [1] 1,006,000    
Reserve for Impairment 308,000.0    
NBV Real Estate 2,899,000    
Industrial Office Properties [Member] | One Park Centre [Member]      
Encumbrances 6,163,000    
Land, Initial Cost 1,206,000    
Building and Improvements, Initial Cost 7,944,000    
Acquisition Price 9,150,000    
Capitalized Improvements 1,927,000    
Land Cost, Total Cost 1,206,000    
Building & Improvements, Total Cost 9,871,000    
Total cost 11,077,000    
Accumulated Depreciation & Depreciation [1] 3,085,000    
Reserve for Impairment 0    
NBV Real Estate 7,992,000    
Industrial Office Properties [Member] | Shea Center II [Member]      
Encumbrances 17,230,000    
Land, Initial Cost 2,214,000    
Building and Improvements, Initial Cost 23,747,000    
Acquisition Price 25,961,000    
Capitalized Improvements 2,754,000    
Land Cost, Total Cost 2,214,000    
Building & Improvements, Total Cost 26,501,000    
Total cost 28,715,000    
Accumulated Depreciation & Depreciation [1] 9,213,000    
Reserve for Impairment 0    
NBV Real Estate 19,502,000    
Industrial Office Properties [Member] | McElderry [Member]      
Encumbrances 5,670,000    
Land, Initial Cost 215,000    
Building and Improvements, Initial Cost 8,677,000    
Acquisition Price 8,892,000    
Capitalized Improvements 29,000    
Land Cost, Total Cost 215,000    
Building & Improvements, Total Cost 8,705,000    
Total cost 8,920,000    
Accumulated Depreciation & Depreciation 230,000    
Reserve for Impairment    
NBV Real Estate 8,691,000    
Industrial Office Properties [Member] | Mandolin [Member]      
Total cost 4,907,000    
Retail Properties [Member]      
Encumbrances 13,309,000    
Land, Initial Cost 3,488,000    
Building and Improvements, Initial Cost 15,466,000    
Acquisition Price 18,954,000    
Capitalized Improvements 145,000    
Land Cost, Total Cost 3,488,000    
Building & Improvements, Total Cost 15,611,000    
Total cost 19,099,000    
Accumulated Depreciation & Depreciation [1] 2,955,000    
Reserve for Impairment 0    
NBV Real Estate 16,143,000    
Retail Properties [Member] | Union Town Center [Member]      
Encumbrances 8,025,000    
Land, Initial Cost 1,750,000    
Building and Improvements, Initial Cost 9,462,000    
Acquisition Price 11,212,000    
Capitalized Improvements 174,000    
Land Cost, Total Cost 1,750,000    
Building & Improvements, Total Cost 9,636,000    
Total cost 11,386,000    
Accumulated Depreciation & Depreciation [1] 2,347,000    
Reserve for Impairment 0    
NBV Real Estate 9,039,000    
Retail Properties [Member] | Research Parkway [Member]      
Encumbrances 1,648,000    
Land, Initial Cost 408,000    
Building and Improvements, Initial Cost 2,442,000    
Acquisition Price 2,850,000    
Capitalized Improvements (44,000)    
Land Cost, Total Cost 408,000    
Building & Improvements, Total Cost 2,398,000    
Total cost 2,806,000    
Accumulated Depreciation & Depreciation [1] 486,000    
Reserve for Impairment 0    
NBV Real Estate 2,320,000    
Retail Properties [Member] | Mandolin [Member]      
Encumbrances 3,635,000    
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 122,000    
Reserve for Impairment 0    
NBV Real Estate 4,784,000    
Model Home [Member]      
Encumbrances 24,752,000    
Land, Initial Cost 6,174,000    
Building and Improvements, Initial Cost 33,285,000    
Acquisition Price 39,459,000    
Land Cost, Total Cost 6,174,000    
Building & Improvements, Total Cost 33,285,000    
Total cost 39,459,000    
Accumulated Depreciation & Depreciation [1] 1,525,000    
NBV Real Estate 37,934,000    
Model Home [Member] | Model Homes-DMH LP #202 [Member]      
Encumbrances 178,000    
Land, Initial Cost 189,000    
Building and Improvements, Initial Cost 918,000    
Acquisition Price 1,107,000    
Land Cost, Total Cost 189,000    
Building & Improvements, Total Cost 918,000    
Total cost 1,107,000    
Accumulated Depreciation & Depreciation [1] 113,000    
NBV Real Estate 994,000    
Model Home [Member] | Model Homes-DMH LP #203 [Member]      
Encumbrances 1,870,000    
Land, Initial Cost 564,000    
Building and Improvements, Initial Cost 2,490,000    
Acquisition Price 3,055,000    
Land Cost, Total Cost 564,000    
Building & Improvements, Total Cost 2,490,000    
Total cost 3,055,000    
Accumulated Depreciation & Depreciation [1] 247,000    
NBV Real Estate 2,808,000    
Model Home [Member] | Model Homes-DMH LP #204 [Member]      
Encumbrances 1,169,000    
Land, Initial Cost 542,000    
Building and Improvements, Initial Cost 2,799,000    
Acquisition Price 3,340,000    
Land Cost, Total Cost 542,000    
Building & Improvements, Total Cost 2,799,000    
Total cost 3,340,000    
Accumulated Depreciation & Depreciation [1] 251,000    
NBV Real Estate 3,089,000    
Model Home [Member] | Model Homes-DMH LP #205 [Member]      
Encumbrances 3,655,000    
Land, Initial Cost 1,115,000    
Building and Improvements, Initial Cost 4,719,000    
Acquisition Price 5,834,000    
Land Cost, Total Cost 1,115,000    
Building & Improvements, Total Cost 4,719,000    
Total cost 5,834,000    
Accumulated Depreciation & Depreciation [1] 371,000    
NBV Real Estate 5,463,000    
Model Home [Member] | Model Homes-DMH LP #206 [Member]      
Encumbrances 1,471,000    
Land, Initial Cost 289,000    
Building and Improvements, Initial Cost 2,002,000    
Acquisition Price 2,292,000    
Land Cost, Total Cost 289,000    
Building & Improvements, Total Cost 2,002,000    
Total cost 2,292,000    
Accumulated Depreciation & Depreciation [1] 107,000    
NBV Real Estate 2,184,000    
Model Home [Member] | Model Homes-NMH Inc. [Member]      
Encumbrances 16,410,000    
Land, Initial Cost 3,475,000    
Building and Improvements, Initial Cost 20,357,000    
Acquisition Price 23,831,000    
Land Cost, Total Cost 3,475,000    
Building & Improvements, Total Cost 20,357,000    
Total cost 23,831,000    
Accumulated Depreciation & Depreciation [1] 436,000    
NBV Real Estate $ 23,396,000    
[1] Depreciation is computed on a straight-line basis using useful lives up to 39 years.