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Schedule III - Real Estate and Accumulated Depreciation and Amortization - Properties (Details) - USD ($)
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Encumbrances $ 92,922,000    
Land, Initial Cost 17,485,000    
Building and Improvements, Initial Cost 118,704,000    
Acquisition Price 136,095,000    
Capitalized Improvements 22,439,000    
Land Cost, Total Cost 17,485,000    
Building & Improvements, Total Cost 143,506,000    
Total cost 160,991,000    
Accumulated Depreciation & Depreciation 42,695,957 [1] $ 42,359,512 $ 39,083,117
Reserve for Impairment 9,645,000    
NBV Real Estate 108,650,000    
Industrial Office Properties [Member]      
Encumbrances 63,877,000    
Land, Initial Cost 9,528,000    
Building and Improvements, Initial Cost 82,989,000    
Acquisition Price 92,517,000    
Capitalized Improvements 22,425,000    
Land Cost, Total Cost 9,528,000    
Building & Improvements, Total Cost 107,985,000    
Total cost 117,513,000    
Accumulated Depreciation & Depreciation [1] 40,652,000    
Reserve for Impairment 9,408,000    
NBV Real Estate 67,453,000    
Industrial Office Properties [Member] | Genesis Plaza [Member]      
Encumbrances 6,236,000    
Land, Initial Cost 1,400,000    
Building and Improvements, Initial Cost 8,600,000    
Acquisition Price 10,000,000    
Capitalized Improvements 3,738,000    
Land Cost, Total Cost 1,400,000    
Building & Improvements, Total Cost 12,494,000    
Total cost 13,894,000    
Accumulated Depreciation & Depreciation [1] 6,620,000    
Reserve for Impairment 0    
NBV Real Estate 7,274,000    
Industrial Office Properties [Member] | Dakota Center [Member]      
Encumbrances 8,740,000    
Land, Initial Cost 832,000    
Building and Improvements, Initial Cost 8,743,000    
Acquisition Price 9,575,000    
Capitalized Improvements 4,524,000    
Land Cost, Total Cost 832,000    
Building & Improvements, Total Cost 13,267,000    
Total cost 14,099,000    
Accumulated Depreciation & Depreciation [1] 5,053,000    
Reserve for Impairment 4,185,000    
NBV Real Estate 4,861,000    
Industrial Office Properties [Member] | Grand Pacific Center [Member]      
Encumbrances 6,361,000    
Land, Initial Cost 413,000    
Building and Improvements, Initial Cost 4,926,000    
Acquisition Price 5,339,000    
Capitalized Improvements 3,581,000    
Land Cost, Total Cost 413,000    
Building & Improvements, Total Cost 11,197,000    
Total cost 11,610,000    
Accumulated Depreciation & Depreciation [1] 3,527,000    
Reserve for Impairment 0    
NBV Real Estate 8,083,000    
Industrial Office Properties [Member] | Arapahoe Center [Member]      
Encumbrances 8,670,000    
Land, Initial Cost 1,420,000    
Building and Improvements, Initial Cost 10,430,000    
Acquisition Price 11,850,000    
Capitalized Improvements 1,680,000    
Land Cost, Total Cost 1,420,000    
Building & Improvements, Total Cost 12,110,000    
Total cost 13,530,000    
Accumulated Depreciation & Depreciation [1] 4,656,000    
Reserve for Impairment 0    
NBV Real Estate 8,874,000    
Industrial Office Properties [Member] | West Fargo Industrial [Member]      
Encumbrances 5,750,000    
Land, Initial Cost 1,693,000    
Building and Improvements, Initial Cost 6,207,000    
Acquisition Price 7,900,000    
Capitalized Improvements 767,000    
Land Cost, Total Cost 1,693,000    
Building & Improvements, Total Cost 6,974,000    
Total cost 8,667,000    
Accumulated Depreciation & Depreciation [1] 2,262,000    
Reserve for Impairment 0    
NBV Real Estate 6,405,000    
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 542,000    
Land Cost, Total Cost 135,000    
Building & Improvements, Total Cost 4,257,000    
Total cost 4,392,000    
Accumulated Depreciation & Depreciation [1] 1,413,000    
Reserve for Impairment 1,030,000    
NBV Real Estate 1,949,000    
Industrial Office Properties [Member] | One Park Centre [Member]      
Encumbrances 6,097,000    
Land, Initial Cost 1,206,000    
Building and Improvements, Initial Cost 7,944,000    
Acquisition Price 9,150,000    
Capitalized Improvements 2,962,000    
Land Cost, Total Cost 1,206,000    
Building & Improvements, Total Cost 10,906,000    
Total cost 12,112,000    
Accumulated Depreciation & Depreciation [1] 4,405,000    
Reserve for Impairment 1,966,000    
NBV Real Estate 5,741,000    
Industrial Office Properties [Member] | Shea Center II [Member]      
Encumbrances 16,353,000    
Land, Initial Cost 2,214,000    
Building and Improvements, Initial Cost 23,747,000    
Acquisition Price 25,961,000    
Capitalized Improvements 4,603,000    
Land Cost, Total Cost 2,214,000    
Building & Improvements, Total Cost 28,075,000    
Total cost 30,289,000    
Accumulated Depreciation & Depreciation [1] 11,812,000    
Reserve for Impairment 2,227,000    
NBV Real Estate 16,250,000    
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 28,000    
Land Cost, Total Cost 215,000    
Building & Improvements, Total Cost 8,705,000    
Total cost 8,920,000    
Accumulated Depreciation & Depreciation 904,000    
Reserve for Impairment 0    
NBV Real Estate 8,016,000    
Industrial Office Properties [Member] | Mandolin [Member]      
Total cost 4,907,000    
Retail Properties [Member]      
Encumbrances 3,441,000    
Land, Initial Cost 1,330,000    
Building and Improvements, Initial Cost 3,562,000    
Acquisition Price 4,892,000    
Capitalized Improvements 14,000    
Land Cost, Total Cost 1,330,000    
Building & Improvements, Total Cost 3,577,000    
Total cost 4,907,000    
Accumulated Depreciation & Depreciation [1] 397,000    
Reserve for Impairment 0    
NBV Real Estate 4,510,000    
Retail Properties [Member] | Mandolin [Member]      
Encumbrances 3,441,000    
Land, Initial Cost 1,330,000    
Building and Improvements, Initial Cost 3,562,000    
Acquisition Price 4,892,000    
Capitalized Improvements 14,000    
Land Cost, Total Cost 1,330,000    
Building & Improvements, Total Cost 3,577,000    
Accumulated Depreciation & Depreciation 397,000    
Reserve for Impairment 0    
NBV Real Estate 4,510,000    
Model Home [Member]      
Encumbrances 25,604,000    
Land, Initial Cost 6,627,000    
Building and Improvements, Initial Cost 32,153,000    
Acquisition Price 38,686,000    
Land Cost, Total Cost 6,627,000    
Building & Improvements, Total Cost 31,944,000    
Total cost 38,571,000    
Accumulated Depreciation & Depreciation [1] 1,647,000    
Reserve for Impairment 237,000    
NBV Real Estate 36,687,000    
Model Home [Member] | Model Homes-DMH LP #202 [Member]      
Encumbrances 213,000    
Land, Initial Cost 65,000    
Building and Improvements, Initial Cost 299,000    
Acquisition Price 364,000    
Land Cost, Total Cost 65,000    
Building & Improvements, Total Cost 299,000    
Total cost 364,000    
Accumulated Depreciation & Depreciation [1] 41,000    
NBV Real Estate 323,000    
Model Home [Member] | Model Homes-DMH LP #203 [Member]      
Encumbrances 601,000    
Land, Initial Cost 226,000    
Building and Improvements, Initial Cost 2,004,000    
Acquisition Price 2,411,000    
Land Cost, Total Cost 226,000    
Building & Improvements, Total Cost 807,000    
Total cost 1,033,000    
Accumulated Depreciation & Depreciation [1] 119,000    
NBV Real Estate 914,000    
Model Home [Member] | Model Homes-DMH LP #204 [Member]      
Encumbrances 4,692,000    
Land, Initial Cost 1,249,000    
Building and Improvements, Initial Cost 6,795,000    
Acquisition Price 8,252,000    
Land Cost, Total Cost 1,249,000    
Building & Improvements, Total Cost 5,834,000    
Total cost 7,083,000    
Accumulated Depreciation & Depreciation [1] 313,000    
NBV Real Estate 6,737,000    
Model Home [Member] | Model Homes-NMH Inc. [Member]      
Encumbrances 20,098,000    
Land, Initial Cost 5,087,000    
Building and Improvements, Initial Cost 23,055,000    
Acquisition Price 27,659,000    
Land Cost, Total Cost 5,087,000    
Building & Improvements, Total Cost 25,004,000    
Total cost 30,091,000    
Accumulated Depreciation & Depreciation [1] 1,174,000    
Reserve for Impairment 204,000    
NBV Real Estate $ 28,713,000    
[1] Depreciation is computed on a straight-line basis using useful lives up to 39 years.