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Schedule III - Real Estate and Accumulated Depreciation and Amortization - Properties (Details) - USD ($)
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Encumbrances $ 109,014,000    
Land, Initial Cost 21,662,000    
Building and Improvements, Initial Cost 142,933,000    
Acquisition Price 164,595,000    
Capitalized Improvements 21,076,000    
Land Cost, Total Cost 21,662,000    
Building & Improvements, Total Cost 164,284,000    
Total cost 185,946,000    
Accumulated Depreciation & Depreciation 39,083,117 [1] $ 34,803,778 $ 32,948,757
Reserve for Impairment 2,706,000    
NBV Real Estate 144,156,000    
Industrial Office Properties [Member]      
Encumbrances 60,619,000    
Land, Initial Cost 9,528,000    
Building and Improvements, Initial Cost 82,989,000    
Acquisition Price 92,517,000    
Capitalized Improvements 20,781,000    
Land Cost, Total Cost 9,528,000    
Building & Improvements, Total Cost 104,045,000    
Total cost 113,573,000    
Accumulated Depreciation & Depreciation [1] 33,810,000    
Reserve for Impairment 2,274,100    
NBV Real Estate 77,489,000    
Industrial Office Properties [Member] | Genesis Plaza [Member]      
Encumbrances 5,937,000    
Land, Initial Cost 1,400,000    
Building and Improvements, Initial Cost 8,600,000    
Acquisition Price 10,000,000    
Capitalized Improvements 3,169,000    
Land Cost, Total Cost 1,400,000    
Building & Improvements, Total Cost 11,769,000    
Total cost 13,169,000    
Accumulated Depreciation & Depreciation [1] 5,626,000    
Reserve for Impairment 0    
NBV Real Estate 7,543,000    
Industrial Office Properties [Member] | Dakota Center [Member]      
Encumbrances 9,197,000    
Land, Initial Cost 832,000    
Building and Improvements, Initial Cost 8,743,000    
Acquisition Price 9,575,000    
Capitalized Improvements 4,228,000    
Land Cost, Total Cost 832,000    
Building & Improvements, Total Cost 12,971,000    
Total cost 13,803,000    
Accumulated Depreciation & Depreciation [1] 4,601,000    
Reserve for Impairment 0    
NBV Real Estate 9,202,000    
Industrial Office Properties [Member] | Grand Pacific Center [Member]      
Encumbrances 5,470,000    
Land, Initial Cost 413,000    
Building and Improvements, Initial Cost 4,926,000    
Acquisition Price 5,339,000    
Capitalized Improvements 5,206,000    
Land Cost, Total Cost 413,000    
Building & Improvements, Total Cost 10,407,000    
Total cost 10,820,000    
Accumulated Depreciation & Depreciation [1] 2,546,000    
Reserve for Impairment 0    
NBV Real Estate 8,274,000    
Industrial Office Properties [Member] | Arapahoe Center [Member]      
Encumbrances 7,426,000    
Land, Initial Cost 1,420,000    
Building and Improvements, Initial Cost 10,430,000    
Acquisition Price 11,850,000    
Capitalized Improvements 1,601,000    
Land Cost, Total Cost 1,420,000    
Building & Improvements, Total Cost 12,031,000    
Total cost 13,451,000    
Accumulated Depreciation & Depreciation [1] 4,109,000    
Reserve for Impairment 0    
NBV Real Estate 9,342,000    
Industrial Office Properties [Member] | West Fargo Industrial [Member]      
Encumbrances 3,923,000    
Land, Initial Cost 1,693,000    
Building and Improvements, Initial Cost 6,207,000    
Acquisition Price 7,900,000    
Capitalized Improvements 657,000    
Land Cost, Total Cost 1,693,000    
Building & Improvements, Total Cost 6,864,000    
Total cost 8,557,000    
Accumulated Depreciation & Depreciation [1] 1,737,000    
Reserve for Impairment 0    
NBV Real Estate 6,820,000    
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 371,000    
Land Cost, Total Cost 135,000    
Building & Improvements, Total Cost 4,086,000    
Total cost 4,221,000    
Accumulated Depreciation & Depreciation [1] 1,139,000    
Reserve for Impairment 308,000    
NBV Real Estate 2,774,000    
Industrial Office Properties [Member] | One Park Centre [Member]      
Encumbrances 6,044,000    
Land, Initial Cost 1,206,000    
Building and Improvements, Initial Cost 7,944,000    
Acquisition Price 9,150,000    
Capitalized Improvements 2,070,000    
Land Cost, Total Cost 1,206,000    
Building & Improvements, Total Cost 10,014,000    
Total cost 11,220,000    
Accumulated Depreciation & Depreciation [1] 3,553,000    
Reserve for Impairment 1,966,100    
NBV Real Estate 5,700,000    
Industrial Office Properties [Member] | Shea Center II [Member]      
Encumbrances 16,951,000    
Land, Initial Cost 2,214,000    
Building and Improvements, Initial Cost 23,747,000    
Acquisition Price 25,961,000    
Capitalized Improvements 3,451,000    
Land Cost, Total Cost 2,214,000    
Building & Improvements, Total Cost 27,198,000    
Total cost 29,412,000    
Accumulated Depreciation & Depreciation [1] 10,044,000    
Reserve for Impairment 0    
NBV Real Estate 19,368,000    
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 454,000    
Reserve for Impairment    
NBV Real Estate 8,466,000    
Industrial Office Properties [Member] | Mandolin [Member]      
Total cost 4,907,000    
Retail Properties [Member]      
Encumbrances 13,032,000    
Land, Initial Cost 3,488,000    
Building and Improvements, Initial Cost 15,466,000    
Acquisition Price 18,954,000    
Capitalized Improvements 295,000    
Land Cost, Total Cost 3,488,000    
Building & Improvements, Total Cost 15,761,000    
Total cost 19,249,000    
Accumulated Depreciation & Depreciation [1] 3,371,000    
Reserve for Impairment 0    
NBV Real Estate 15,878,000    
Retail Properties [Member] | Union Town Center [Member]      
Encumbrances 7,870,000    
Land, Initial Cost 1,750,000    
Building and Improvements, Initial Cost 9,462,000    
Acquisition Price 11,212,000    
Capitalized Improvements 317,000    
Land Cost, Total Cost 1,750,000    
Building & Improvements, Total Cost 9,779,000    
Total cost 11,529,000    
Accumulated Depreciation & Depreciation [1] 2,610,000    
Reserve for Impairment 0    
NBV Real Estate 8,919,000    
Retail Properties [Member] | Research Parkway [Member]      
Encumbrances 1,589,000    
Land, Initial Cost 408,000    
Building and Improvements, Initial Cost 2,442,000    
Acquisition Price 2,850,000    
Capitalized Improvements (37,000)    
Land Cost, Total Cost 408,000    
Building & Improvements, Total Cost 2,405,000    
Total cost 2,813,000    
Accumulated Depreciation & Depreciation [1] 547,000    
Reserve for Impairment 0    
NBV Real Estate 2,266,000    
Retail Properties [Member] | Mandolin [Member]      
Encumbrances 3,573,000    
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 214,000    
Reserve for Impairment 0    
NBV Real Estate 4,693,000    
Model Home [Member]      
Encumbrances 35,363,000    
Land, Initial Cost 8,646,000    
Building and Improvements, Initial Cost 44,478,000    
Acquisition Price 53,124,000    
Land Cost, Total Cost 8,646,000    
Building & Improvements, Total Cost 44,478,000    
Total cost 53,124,000    
Accumulated Depreciation & Depreciation [1] 1,902,000    
Reserve for Impairment 432,000    
NBV Real Estate 50,789,000    
Model Home [Member] | Model Homes-DMH LP #202 [Member]      
Encumbrances 269,000    
Land, Initial Cost 83,000    
Building and Improvements, Initial Cost 400,000    
Acquisition Price 483,000    
Land Cost, Total Cost 83,000    
Building & Improvements, Total Cost 400,000    
Total cost 483,000    
Accumulated Depreciation & Depreciation [1] 64,000    
NBV Real Estate 419,000    
Model Home [Member] | Model Homes-DMH LP #203 [Member]      
Encumbrances 643,000    
Land, Initial Cost 202,000    
Building and Improvements, Initial Cost 858,000    
Acquisition Price 1,060,000    
Land Cost, Total Cost 202,000    
Building & Improvements, Total Cost 858,000    
Total cost 1,060,000    
Accumulated Depreciation & Depreciation [1] 96,000    
NBV Real Estate 964,000    
Model Home [Member] | Model Homes-DMH LP #204 [Member]      
Encumbrances 940,000    
Land, Initial Cost 278,000    
Building and Improvements, Initial Cost 1,286,000    
Acquisition Price 1,564,000    
Land Cost, Total Cost 278,000    
Building & Improvements, Total Cost 1,286,000    
Total cost 1,564,000    
Accumulated Depreciation & Depreciation [1] 137,000    
NBV Real Estate 1,427,000    
Model Home [Member] | Model Homes-DMH LP #205 [Member]      
Encumbrances 2,762,000    
Land, Initial Cost 791,000    
Building and Improvements, Initial Cost 3,732,000    
Acquisition Price 4,523,000    
Land Cost, Total Cost 791,000    
Building & Improvements, Total Cost 3,732,000    
Total cost 4,523,000    
Accumulated Depreciation & Depreciation [1] 380,000    
NBV Real Estate 4,142,000    
Model Home [Member] | Model Homes-DMH LP #206 [Member]      
Encumbrances 1,416,000    
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] 158,000    
NBV Real Estate 2,133,000    
Model Home [Member] | Model Homes-DMH LP 207 [Member]      
Encumbrances 5,065,000    
Land, Initial Cost 1,323,000    
Building and Improvements, Initial Cost 5,938,000    
Acquisition Price 7,262,000    
Land Cost, Total Cost 1,323,000    
Building & Improvements, Total Cost 5,938,000    
Total cost 7,262,000    
Accumulated Depreciation & Depreciation [1] 17,000    
NBV Real Estate 7,244,000    
Model Home [Member] | Model Homes-NMH Inc. [Member]      
Encumbrances 24,270,000    
Land, Initial Cost 5,679,000    
Building and Improvements, Initial Cost 30,262,000    
Acquisition Price 35,941,000    
Land Cost, Total Cost 5,679,000    
Building & Improvements, Total Cost 30,262,000    
Total cost 35,941,000    
Accumulated Depreciation & Depreciation [1] 1,050,000    
Reserve for Impairment 432,000    
NBV Real Estate $ 34,460,000    
[1] Depreciation is computed on a straight-line basis using useful lives up to 39 years.