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Schedule III - Real Estate and Accumulated Depreciation and Amortization - Properties (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Encumbrances |  | $ 120,788,000 |  |  |
Land, Initial Cost |  | 30,297,000 |  |  |
Building and Improvements, Initial Cost |  | 164,472,000 |  |  |
Acquisition Price |  | 195,452,000 |  |  |
Capitalized Improvements |  | 26,279,000 |  |  |
Land Cost, Total Cost |  | 30,330,000 |  |  |
Building & Improvements, Total Cost |  | 155,296,000 |  |  |
Total cost |  | 211,905,000 |  |  |
Accumulated Depreciation & Depreciation |  | 42,387,199 | [1] | $ 44,113,962 | $ 43,567,809
Reserve for Impairment |  | 3,264,000 |  |  |
NBV Real Estate |  | 166,254,000 |  |  |
Industrial Office Properties [Member] |  |  |  |  |
Encumbrances |  | 73,618,000 |  |  |
Land, Initial Cost |  | 16,539,000 |  |  |
Building and Improvements, Initial Cost |  | 104,660,000 |  |  |
Acquisition Price |  | 121,882,000 |  |  |
Capitalized Improvements |  | 23,723,000 |  |  |
Land Cost, Total Cost |  | 16,539,000 |  |  |
Building & Improvements, Total Cost |  | 94,071,000 |  |  |
Total cost |  | 134,333,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 34,743,000 |  |  |
Reserve for Impairment |  | 400,000 |  |  |
NBV Real Estate |  | 99,190,000 |  |  |
Industrial Office Properties [Member] | Garden Gateway [Member] |  |  |  |  |
Encumbrances | [2],[3] | 5,861,000 |  |  |
Land, Initial Cost | [2],[3] | 3,035,000 |  |  |
Building and Improvements, Initial Cost | [2],[3] | 12,091,000 |  |  |
Acquisition Price | [2],[3] | 15,126,000 |  |  |
Capitalized Improvements | [2],[3] | 3,329,000 |  |  |
Land Cost, Total Cost | [2],[3] | 3,035,000 |  |  |
Building & Improvements, Total Cost | [2],[3] | 10,874,000 |  |  |
Total cost | [2],[3] | 17,238,000 |  |  |
Accumulated Depreciation & Depreciation | [1],[2],[3] | 5,774,000 |  |  |
Reserve for Impairment | [2],[3] | 0 |  |  |
NBV Real Estate | [2],[3] | 11,464,000 |  |  |
Industrial Office Properties [Member] | Executive Park [Member] |  |  |  |  |
Encumbrances |  | 2,986,000 |  |  |
Land, Initial Cost |  | 583,000 |  |  |
Building and Improvements, Initial Cost |  | 8,815,000 |  |  |
Acquisition Price |  | 10,081,000 |  |  |
Capitalized Improvements |  | 1,473,000 |  |  |
Land Cost, Total Cost |  | 583,000 |  |  |
Building & Improvements, Total Cost |  | 5,561,000 |  |  |
Total cost |  | 7,617,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 2,510,000 |  |  |
Reserve for Impairment |  | 0 |  |  |
NBV Real Estate |  | 5,107,000 |  |  |
Industrial Office Properties [Member] | Genesis Plaza [Member] |  |  |  |  |
Encumbrances |  | 6,276,000 |  |  |
Land, Initial Cost |  | 1,400,000 |  |  |
Building and Improvements, Initial Cost |  | 8,600,000 |  |  |
Acquisition Price |  | 10,000,000 |  |  |
Capitalized Improvements |  | 2,625,000 |  |  |
Land Cost, Total Cost |  | 1,400,000 |  |  |
Building & Improvements, Total Cost |  | 8,323,000 |  |  |
Total cost |  | 12,348,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 3,697,000 |  |  |
Reserve for Impairment |  | 0 |  |  |
NBV Real Estate |  | 8,651,000 |  |  |
Industrial Office Properties [Member] | Dakota Center [Member] |  |  |  |  |
Encumbrances |  | 9,900,000 |  |  |
Land, Initial Cost |  | 832,000 |  |  |
Building and Improvements, Initial Cost |  | 8,743,000 |  |  |
Acquisition Price |  | 9,575,000 |  |  |
Capitalized Improvements |  | 1,306,000 |  |  |
Land Cost, Total Cost |  | 832,000 |  |  |
Building & Improvements, Total Cost |  | 9,960,000 |  |  |
Total cost |  | 12,098,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 3,500,000 |  |  |
Reserve for Impairment |  | 0 |  |  |
NBV Real Estate |  | 8,598,000 |  |  |
Industrial Office Properties [Member] | Grand Pacific Center [Member] |  |  |  |  |
Encumbrances |  | 3,738,000 |  |  |
Land, Initial Cost |  | 413,000 |  |  |
Building and Improvements, Initial Cost |  | 4,926,000 |  |  |
Acquisition Price |  | 5,339,000 |  |  |
Capitalized Improvements |  | 904,000 |  |  |
Land Cost, Total Cost |  | 413,000 |  |  |
Building & Improvements, Total Cost |  | 6,099,000 |  |  |
Total cost |  | 7,416,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 1,732,000 |  |  |
Reserve for Impairment |  | 0 |  |  |
NBV Real Estate |  | 5,684,000 |  |  |
Industrial Office Properties [Member] | Arapahoe Center [Member] |  |  |  |  |
Encumbrances |  | 7,932,000 |  |  |
Land, Initial Cost |  | 1,420,000 |  |  |
Building and Improvements, Initial Cost |  | 10,430,000 |  |  |
Acquisition Price |  | 11,850,000 |  |  |
Capitalized Improvements |  | 2,078,000 |  |  |
Land Cost, Total Cost |  | 1,420,000 |  |  |
Building & Improvements, Total Cost |  | 8,857,000 |  |  |
Total cost |  | 12,355,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 3,122,000 |  |  |
Reserve for Impairment |  | 0 |  |  |
NBV Real Estate |  | 9,233,000 |  |  |
Industrial Office Properties [Member] | West Fargo Industrial [Member] |  |  |  |  |
Encumbrances |  | 4,263,000 |  |  |
Land, Initial Cost |  | 1,693,000 |  |  |
Building and Improvements, Initial Cost |  | 6,207,000 |  |  |
Acquisition Price |  | 7,900,000 |  |  |
Capitalized Improvements |  | 264,000 |  |  |
Land Cost, Total Cost |  | 1,693,000 |  |  |
Building & Improvements, Total Cost |  | 6,099,000 |  |  |
Total cost |  | 8,056,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 995,000 |  |  |
Reserve for Impairment |  | 0 |  |  |
NBV Real Estate |  | 7,061,000 |  |  |
Industrial Office Properties [Member] | The 300 N.P [Member] |  |  |  |  |
Encumbrances |  | 2,274,000 |  |  |
Land, Initial Cost |  | 135,000 |  |  |
Building and Improvements, Initial Cost |  | 3,715,000 |  |  |
Acquisition Price |  | 3,850,000 |  |  |
Capitalized Improvements |  | 319,000 |  |  |
Land Cost, Total Cost |  | 135,000 |  |  |
Building & Improvements, Total Cost |  | 3,589,000 |  |  |
Total cost |  | 4,043,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 764,000 |  |  |
Reserve for Impairment |  | 0 |  |  |
NBV Real Estate |  | 3,279,000 |  |  |
Industrial Office Properties [Member] | Highland Court [Member] |  |  |  |  |
Encumbrances |  | 6,275,000 |  |  |
Land, Initial Cost |  | 3,608,000 |  |  |
Building and Improvements, Initial Cost |  | 9,442,000 |  |  |
Acquisition Price |  | 13,050,000 |  |  |
Capitalized Improvements |  | 3,408,000 |  |  |
Land Cost, Total Cost |  | 3,608,000 |  |  |
Building & Improvements, Total Cost |  | 7,767,000 |  |  |
Total cost |  | 14,783,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 3,883,000 |  |  |
Reserve for Impairment |  | 400,000 |  |  |
NBV Real Estate |  | 10,500,000 |  |  |
Industrial Office Properties [Member] | One Park Centre [Member] |  |  |  |  |
Encumbrances |  | 6,385,000 |  |  |
Land, Initial Cost |  | 1,206,000 |  |  |
Building and Improvements, Initial Cost |  | 7,944,000 |  |  |
Acquisition Price |  | 9,150,000 |  |  |
Capitalized Improvements |  | 1,952,000 |  |  |
Land Cost, Total Cost |  | 1,206,000 |  |  |
Building & Improvements, Total Cost |  | 7,416,000 |  |  |
Total cost |  | 10,574,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 1,987,000 |  |  |
Reserve for Impairment |  | 0 |  |  |
NBV Real Estate |  | 8,587,000 |  |  |
Industrial Office Properties [Member] | Shea Center II [Member] |  |  |  |  |
Encumbrances |  | 17,728,000 |  |  |
Land, Initial Cost |  | 2,214,000 |  |  |
Building and Improvements, Initial Cost |  | 23,747,000 |  |  |
Acquisition Price |  | 25,961,000 |  |  |
Capitalized Improvements |  | 6,065,000 |  |  |
Land Cost, Total Cost |  | 2,214,000 |  |  |
Building & Improvements, Total Cost |  | 19,526,000 |  |  |
Total cost |  | 27,805,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 6,779,000 |  |  |
Reserve for Impairment |  | 0 |  |  |
NBV Real Estate |  | 21,026,000 |  |  |
Retail Properties [Member] |  |  |  |  |
Encumbrances |  | 19,087,000 |  |  |
Land, Initial Cost |  | 6,206,000 |  |  |
Building and Improvements, Initial Cost |  | 22,950,000 |  |  |
Acquisition Price |  | 29,156,000 |  |  |
Capitalized Improvements |  | 2,556,000 |  |  |
Land Cost, Total Cost |  | 6,239,000 |  |  |
Building & Improvements, Total Cost |  | 24,363,000 |  |  |
Total cost |  | 33,158,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 5,740,000 |  |  |
Reserve for Impairment |  | 2,864,000 |  |  |
NBV Real Estate |  | 24,554,000 |  |  |
Retail Properties [Member] | World Plaza [Member] |  |  |  |  |
Encumbrances | [3] | 5,803,000 |  |  |
Land, Initial Cost | [3] | 1,698,000 |  |  |
Building and Improvements, Initial Cost | [3] | 6,232,000 |  |  |
Acquisition Price | [3] | 7,930,000 |  |  |
Capitalized Improvements | [3] | 1,761,000 |  |  |
Land Cost, Total Cost | [3] | 1,698,000 |  |  |
Building & Improvements, Total Cost | [3] | 8,758,000 |  |  |
Total cost | [3] | 12,217,000 |  |  |
Accumulated Depreciation & Depreciation | [1],[3] | 2,246,000 |  |  |
Reserve for Impairment | [3] | 700,000 |  |  |
NBV Real Estate | [3] | 9,271,000 |  |  |
Retail Properties [Member] | Waterman Plaza [Member] |  |  |  |  |
Encumbrances | [4] | 3,208,000 |  |  |
Land, Initial Cost | [4] | 2,350,000 |  |  |
Building and Improvements, Initial Cost | [4] | 4,814,000 |  |  |
Acquisition Price | [4] | 7,164,000 |  |  |
Capitalized Improvements | [4] | 239,000 |  |  |
Land Cost, Total Cost | [4] | 2,383,000 |  |  |
Building & Improvements, Total Cost | [4] | 4,324,000 |  |  |
Total cost | [4] | 6,946,000 |  |  |
Accumulated Depreciation & Depreciation | [1],[4] | 1,282,000 |  |  |
Reserve for Impairment | [4] | 2,164,000 |  |  |
NBV Real Estate | [4] | 3,500,000 |  |  |
Retail Properties [Member] | Union Town Center [Member] |  |  |  |  |
Encumbrances |  | 8,316,000 |  |  |
Land, Initial Cost |  | 1,750,000 |  |  |
Building and Improvements, Initial Cost |  | 9,462,000 |  |  |
Acquisition Price |  | 11,212,000 |  |  |
Capitalized Improvements |  | 513,000 |  |  |
Land Cost, Total Cost |  | 1,750,000 |  |  |
Building & Improvements, Total Cost |  | 8,932,000 |  |  |
Total cost |  | 11,195,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 1,851,000 |  |  |
Reserve for Impairment |  | 0 |  |  |
NBV Real Estate |  | 9,344,000 |  |  |
Retail Properties [Member] | Research Parkway [Member] |  |  |  |  |
Encumbrances |  | 1,760,000 |  |  |
Land, Initial Cost |  | 408,000 |  |  |
Building and Improvements, Initial Cost |  | 2,442,000 |  |  |
Acquisition Price |  | 2,850,000 |  |  |
Capitalized Improvements |  | 43,000 |  |  |
Land Cost, Total Cost |  | 408,000 |  |  |
Building & Improvements, Total Cost |  | 2,349,000 |  |  |
Total cost |  | 2,800,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 361,000 |  |  |
Reserve for Impairment |  | 0 |  |  |
NBV Real Estate |  | 2,439,000 |  |  |
Model Home [Member] |  |  |  |  |
Encumbrances |  | 28,083,000 |  |  |
Land, Initial Cost |  | 7,552,000 |  |  |
Building and Improvements, Initial Cost |  | 36,862,000 |  |  |
Acquisition Price |  | 44,414,000 |  |  |
Land Cost, Total Cost |  | 7,552,000 |  |  |
Building & Improvements, Total Cost |  | 36,862,000 |  |  |
Total cost |  | 44,414,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 1,904,000 |  |  |
NBV Real Estate |  | 42,510,000 |  |  |
Model Home [Member] | Model Homes -NDMHR, LP [Member] |  |  |  |  |
Encumbrances |  | 974,000 |  |  |
Land, Initial Cost |  | 534,000 |  |  |
Building and Improvements, Initial Cost |  | 2,047,000 |  |  |
Acquisition Price |  | 2,581,000 |  |  |
Land Cost, Total Cost |  | 534,000 |  |  |
Building & Improvements, Total Cost |  | 2,047,000 |  |  |
Total cost |  | 2,581,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 197,000 |  |  |
NBV Real Estate |  | 2,384,000 |  |  |
Model Home [Member] | Model Homes-DMH LP #202 [Member] |  |  |  |  |
Encumbrances |  | 3,149,000 |  |  |
Land, Initial Cost |  | 741,000 |  |  |
Building and Improvements, Initial Cost |  | 4,238,000 |  |  |
Acquisition Price |  | 4,979,000 |  |  |
Land Cost, Total Cost |  | 741,000 |  |  |
Building & Improvements, Total Cost |  | 4,238,000 |  |  |
Total cost |  | 4,979,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 337,000 |  |  |
NBV Real Estate |  | 4,642,000 |  |  |
Model Home [Member] | Model Homes-DMH LP #203 [Member] |  |  |  |  |
Encumbrances |  | 5,271,000 |  |  |
Land, Initial Cost |  | 1,600,000 |  |  |
Building and Improvements, Initial Cost |  | 7,132,000 |  |  |
Acquisition Price |  | 8,732,000 |  |  |
Land Cost, Total Cost |  | 1,600,000 |  |  |
Building & Improvements, Total Cost |  | 7,132,000 |  |  |
Total cost |  | 8,732,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 441,000 |  |  |
NBV Real Estate |  | 8,291,000 |  |  |
Model Home [Member] | Model Homes-DMH LP #204 [Member] |  |  |  |  |
Encumbrances |  | 5,385,000 |  |  |
Land, Initial Cost |  | 1,412,000 |  |  |
Building and Improvements, Initial Cost |  | 6,787,000 |  |  |
Acquisition Price |  | 8,199,000 |  |  |
Land Cost, Total Cost |  | 1,412,000 |  |  |
Building & Improvements, Total Cost |  | 6,787,000 |  |  |
Total cost |  | 8,199,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 345,000 |  |  |
NBV Real Estate |  | 7,854,000 |  |  |
Model Home [Member] | Model Homes-DMH LP #205 [Member] |  |  |  |  |
Encumbrances |  | 5,214,000 |  |  |
Land, Initial Cost |  | 1,461,000 |  |  |
Building and Improvements, Initial Cost |  | 6,287,000 |  |  |
Acquisition Price |  | 7,748,000 |  |  |
Land Cost, Total Cost |  | 1,461,000 |  |  |
Building & Improvements, Total Cost |  | 6,287,000 |  |  |
Total cost |  | 7,748,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 179,000 |  |  |
NBV Real Estate |  | 7,569,000 |  |  |
Model Home [Member] | Model Homes-DMH LP #206 [Member] |  |  |  |  |
Encumbrances |  | 1,696,000 |  |  |
Land, Initial Cost |  | 294,000 |  |  |
Building and Improvements, Initial Cost |  | 2,181,000 |  |  |
Acquisition Price |  | 2,475,000 |  |  |
Land Cost, Total Cost |  | 294,000 |  |  |
Building & Improvements, Total Cost |  | 2,181,000 |  |  |
Total cost |  | 2,475,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 27,000 |  |  |
NBV Real Estate |  | 2,448,000 |  |  |
Model Home [Member] | Model Homes-NMH Inc. [Member] |  |  |  |  |
Encumbrances |  | 6,394,000 |  |  |
Land, Initial Cost |  | 1,510,000 |  |  |
Building and Improvements, Initial Cost |  | 8,190,000 |  |  |
Acquisition Price |  | 9,700,000 |  |  |
Land Cost, Total Cost |  | 1,510,000 |  |  |
Building & Improvements, Total Cost |  | 8,190,000 |  |  |
Total cost |  | 9,700,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 378,000 |  |  |
NBV Real Estate |  | $ 9,322,000 |  |  |
[1] | Depreciation is computed on a straight-line basis using useful lives up to 39 years.
[2] | Garden Gateway sold for approximately $11.2 million on February 19, 2021.
[3] | Property held for sale as of December 31, 2020.
[4] | Waterman Plaza sold for approximately $3.5 million on January 28, 2021.

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 -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column B -Subsection 28 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column B)) -URI http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024 + Details
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- Definition Amount of accumulated depreciation pertaining to real estate investments for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column F)) -URI http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column E)) -URI http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024 + Details
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- Definition Amount of land 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 -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column E)) -URI http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024 + Details
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- Definition Amount of land and buildings and improvements made to real estate investments and capitalized after acquisition for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column D)) -URI http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024 + Details
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- Definition Initial cost 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 -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column C)) -URI http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024 + Details
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- Definition Initial cost of land 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 -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column C)) -URI http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024 + Details
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- Definition Amount, before accumulated depreciation, of real estate investment by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. Excludes real estate not held as investment or interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column E)) -URI http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024 + Details
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