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Schedule III - Real Estate and Accumulated Depreciation and Amortization - Properties (Details) - USD ($)
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Encumbrances $ 102,842,000    
Land, Initial Cost 19,639,000    
Building and Improvements, Initial Cost 130,879,000    
Acquisition Price 150,518,000    
Capitalized Improvements 23,280,000    
Land Cost, Total Cost 19,639,000    
Building & Improvements, Total Cost 154,159,000    
Total cost 173,798,000    
Accumulated Depreciation & Depreciation 42,359,512 [1] $ 39,083,117 $ 34,803,778
Reserve for Impairment 3,842,000    
NBV Real Estate 127,596,000    
Industrial Office Properties [Member]      
Encumbrances 64,036,000    
Land, Initial Cost 9,528,000    
Building and Improvements, Initial Cost 82,989,000    
Acquisition Price 92,517,000    
Capitalized Improvements 22,767,000    
Land Cost, Total Cost 9,528,000    
Building & Improvements, Total Cost 105,756,000    
Total cost 115,284,000    
Accumulated Depreciation & Depreciation [1] 37,196,000    
Reserve for Impairment 3,652,000    
NBV Real Estate 74,436,000    
Industrial Office Properties [Member] | Genesis Plaza [Member]      
Encumbrances 5,814,000    
Land, Initial Cost 1,400,000    
Building and Improvements, Initial Cost 8,600,000    
Acquisition Price 10,000,000    
Capitalized Improvements 3,490,000    
Land Cost, Total Cost 1,400,000    
Building & Improvements, Total Cost 12,090,000    
Total cost 13,490,000    
Accumulated Depreciation & Depreciation [1] 6,127,000    
Reserve for Impairment 0    
NBV Real Estate 7,363,000    
Industrial Office Properties [Member] | Dakota Center [Member]      
Encumbrances 9,091,000    
Land, Initial Cost 832,000    
Building and Improvements, Initial Cost 8,743,000    
Acquisition Price 9,575,000    
Capitalized Improvements 4,289,000    
Land Cost, Total Cost 832,000    
Building & Improvements, Total Cost 13,032,000    
Total cost 13,864,000    
Accumulated Depreciation & Depreciation [1] 5,053,000    
Reserve for Impairment 656,000    
NBV Real Estate 8,155,000    
Industrial Office Properties [Member] | Grand Pacific Center [Member]      
Encumbrances 6,460,000    
Land, Initial Cost 413,000    
Building and Improvements, Initial Cost 4,926,000    
Acquisition Price 5,339,000    
Capitalized Improvements 6,056,000    
Land Cost, Total Cost 413,000    
Building & Improvements, Total Cost 10,982,000    
Total cost 11,395,000    
Accumulated Depreciation & Depreciation [1] 2,981,000    
Reserve for Impairment 0    
NBV Real Estate 8,414,000    
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 1,608,000    
Land Cost, Total Cost 1,420,000    
Building & Improvements, Total Cost 12,038,000    
Total cost 13,458,000    
Accumulated Depreciation & Depreciation [1] 4,160,000    
Reserve for Impairment 0    
NBV Real Estate 9,298,000    
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 709,000    
Land Cost, Total Cost 1,693,000    
Building & Improvements, Total Cost 6,916,000    
Total cost 8,609,000    
Accumulated Depreciation & Depreciation [1] 2,010,000    
Reserve for Impairment 0    
NBV Real Estate 6,599,000    
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 418,000    
Land Cost, Total Cost 135,000    
Building & Improvements, Total Cost 4,133,000    
Total cost 4,268,000    
Accumulated Depreciation & Depreciation [1] 1,275,000    
Reserve for Impairment 1,030,000    
NBV Real Estate 1,963,000    
Industrial Office Properties [Member] | One Park Centre [Member]      
Encumbrances 5,920,000    
Land, Initial Cost 1,206,000    
Building and Improvements, Initial Cost 7,944,000    
Acquisition Price 9,150,000    
Capitalized Improvements 2,387,000    
Land Cost, Total Cost 1,206,000    
Building & Improvements, Total Cost 10,331,000    
Total cost 11,537,000    
Accumulated Depreciation & Depreciation [1] 3,989,000    
Reserve for Impairment 1,966,000    
NBV Real Estate 5,582,000    
Industrial Office Properties [Member] | Shea Center II [Member]      
Encumbrances 16,661,000    
Land, Initial Cost 2,214,000    
Building and Improvements, Initial Cost 23,747,000    
Acquisition Price 25,961,000    
Capitalized Improvements 3,782,000    
Land Cost, Total Cost 2,214,000    
Building & Improvements, Total Cost 27,529,000    
Total cost 29,743,000    
Accumulated Depreciation & Depreciation [1] 10,922,000    
Reserve for Impairment 0    
NBV Real Estate 18,821,000    
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 679,000    
Reserve for Impairment    
NBV Real Estate 8,241,000    
Industrial Office Properties [Member] | Mandolin [Member]      
Total cost 4,907,000    
Retail Properties [Member]      
Encumbrances 12,745,000    
Land, Initial Cost 3,488,000    
Building and Improvements, Initial Cost 15,466,000    
Acquisition Price 18,954,000    
Capitalized Improvements 513,000    
Land Cost, Total Cost 3,488,000    
Building & Improvements, Total Cost 15,979,000    
Total cost 19,467,000    
Accumulated Depreciation & Depreciation [1] 3,722,000    
Reserve for Impairment 0    
NBV Real Estate 15,745,000    
Retail Properties [Member] | Union Town Center [Member]      
Encumbrances 7,710,000    
Land, Initial Cost 1,750,000    
Building and Improvements, Initial Cost 9,462,000    
Acquisition Price 11,212,000    
Capitalized Improvements 534,000    
Land Cost, Total Cost 1,750,000    
Building & Improvements, Total Cost 9,996,000    
Total cost 11,746,000    
Accumulated Depreciation & Depreciation [1] 2,823,000    
Reserve for Impairment 0    
NBV Real Estate 8,923,000    
Retail Properties [Member] | Research Parkway [Member]      
Encumbrances 1,527,000    
Land, Initial Cost 408,000    
Building and Improvements, Initial Cost 2,442,000    
Acquisition Price 2,850,000    
Capitalized Improvements (36,000)    
Land Cost, Total Cost 408,000    
Building & Improvements, Total Cost 2,406,000    
Total cost 2,814,000    
Accumulated Depreciation & Depreciation [1] 593,000    
Reserve for Impairment 0    
NBV Real Estate 2,221,000    
Retail Properties [Member] | Mandolin [Member]      
Encumbrances 3,508,000    
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 306,000    
Reserve for Impairment 0    
NBV Real Estate 4,601,000    
Model Home [Member]      
Encumbrances 26,061,000    
Land, Initial Cost 6,623,000    
Building and Improvements, Initial Cost 32,424,000    
Acquisition Price 39,047,000    
Land Cost, Total Cost 6,623,000    
Building & Improvements, Total Cost 32,424,000    
Total cost 39,047,000    
Accumulated Depreciation & Depreciation [1] 1,442,000    
Reserve for Impairment 190,000    
NBV Real Estate 37,415,000    
Model Home [Member] | Model Homes-DMH LP #202 [Member]      
Encumbrances 0    
Land, Initial Cost 0    
Building and Improvements, Initial Cost 0    
Acquisition Price 0    
Land Cost, Total Cost 0    
Building & Improvements, Total Cost 0    
Total cost 0    
Accumulated Depreciation & Depreciation [1] 0    
NBV Real Estate 0    
Model Home [Member] | Model Homes-DMH LP #203 [Member]      
Encumbrances 216,000    
Land, Initial Cost 90,000    
Building and Improvements, Initial Cost 271,000    
Acquisition Price 361,000    
Land Cost, Total Cost 90,000    
Building & Improvements, Total Cost 271,000    
Total cost 361,000    
Accumulated Depreciation & Depreciation [1] 35,000    
NBV Real Estate 326,000    
Model Home [Member] | Model Homes-DMH LP #204 [Member]      
Encumbrances 218,000    
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] 33,000    
NBV Real Estate 331,000    
Model Home [Member] | Model Homes-DMH LP #205 [Member]      
Encumbrances 1,442,000    
Land, Initial Cost 407,000    
Building and Improvements, Initial Cost 2,004,000    
Acquisition Price 2,411,000    
Land Cost, Total Cost 407,000    
Building & Improvements, Total Cost 2,004,000    
Total cost 2,411,000    
Accumulated Depreciation & Depreciation [1] 252,000    
NBV Real Estate 2,159,000    
Model Home [Member] | Model Homes-DMH LP #206 [Member]      
Encumbrances 0    
Land, Initial Cost 0    
Building and Improvements, Initial Cost 0    
Acquisition Price 0    
Land Cost, Total Cost 0    
Building & Improvements, Total Cost 0    
Total cost 0    
Accumulated Depreciation & Depreciation [1] 0    
NBV Real Estate 0    
Model Home [Member] | Model Homes-DMH LP 207 [Member]      
Encumbrances 5,615,000    
Land, Initial Cost 1,457,000    
Building and Improvements, Initial Cost 6,795,000    
Acquisition Price 8,252,000    
Land Cost, Total Cost 1,457,000    
Building & Improvements, Total Cost 6,795,000    
Total cost 8,252,000    
Accumulated Depreciation & Depreciation [1] 191,000    
NBV Real Estate 8,061,000    
Model Home [Member] | Model Homes-NMH Inc. [Member]      
Encumbrances 18,570,000    
Land, Initial Cost 4,604,000    
Building and Improvements, Initial Cost 23,055,000    
Acquisition Price 27,659,000    
Land Cost, Total Cost 4,604,000    
Building & Improvements, Total Cost 23,055,000    
Total cost 27,659,000    
Accumulated Depreciation & Depreciation [1] 931,000    
Reserve for Impairment 190,000    
NBV Real Estate $ 26,538,000    
[1] Depreciation is computed on a straight-line basis using useful lives up to 39 years.