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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.

X
- Definition Amount of lien or mortgage outstanding on real estate investment properties for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 28 -Paragraph Column B -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 970 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column B)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479438/970-360-S99-1 + Details
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- Definition Amount before accumulated depreciation of buildings and improvements for entities with a substantial portion of business acquiring and holding investment real estate. Excludes real estate not held as an investment or interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 970 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column E)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479438/970-360-S99-1 + Details
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