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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.

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