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Schedule III - Real Estate and Accumulated Depreciation and Amortization - Properties (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Encumbrances |  | $ 143,459,000 |  |  |
Land, Initial Cost |  | 36,280,000 |  |  |
Building and Improvements, Initial Cost |  | 195,491,000 |  |  |
Acquisition Price |  | 231,771,000 |  |  |
Capitalized Improvements |  | 31,399,000 |  |  |
Land Cost, Total Cost |  | 35,884,000 |  |  |
Building & Improvements, Total Cost |  | 178,571,000 |  |  |
Total cost |  | 245,854,000 |  |  |
Accumulated Depreciation & Depreciation |  | 44,113,962 | [1] | $ 43,567,809 | $ 40,012,255
Reserve for Impairment |  | 1,533,000 |  |  |
NBV Real Estate |  | 200,207,000 |  |  |
Industrial Office Properties [Member] |  |  |  |  |
Encumbrances |  | 92,309,000 |  |  |
Land, Initial Cost |  | 20,964,000 |  |  |
Building and Improvements, Initial Cost |  | 125,843,000 |  |  |
Acquisition Price |  | 146,807,000 |  |  |
Capitalized Improvements |  | 29,743,000 |  |  |
Land Cost, Total Cost |  | 20,964,000 |  |  |
Building & Improvements, Total Cost |  | 112,457,000 |  |  |
Total cost |  | 163,164,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 36,742,000 |  |  |
Reserve for Impairment |  |  |  |  |
NBV Real Estate |  | 126,422,000 |  |  |
Industrial Office Properties [Member] | Garden Gateway [Member] |  |  |  |  |
Encumbrances | [2] | 6,071,000 |  |  |
Land, Initial Cost | [2] | 3,035,000 |  |  |
Building and Improvements, Initial Cost | [2] | 12,091,000 |  |  |
Acquisition Price | [2] | 15,126,000 |  |  |
Capitalized Improvements | [2] | 3,293,000 |  |  |
Land Cost, Total Cost | [2] | 3,035,000 |  |  |
Building & Improvements, Total Cost | [2] | 10,874,000 |  |  |
Total cost | [2] | 17,202,000 |  |  |
Accumulated Depreciation & Depreciation | [1],[2] | 5,774,000 |  |  |
Reserve for Impairment | [2] |  |  |  |
NBV Real Estate | [2] | 11,428,000 |  |  |
Industrial Office Properties [Member] | Executive Park [Member] |  |  |  |  |
Encumbrances |  | 4,840,000 |  |  |
Land, Initial Cost |  | 1,266,000 |  |  |
Building and Improvements, Initial Cost |  | 8,815,000 |  |  |
Acquisition Price |  | 10,081,000 |  |  |
Capitalized Improvements |  | 1,511,000 |  |  |
Land Cost, Total Cost |  | 1,266,000 |  |  |
Building & Improvements, Total Cost |  | 7,880,000 |  |  |
Total cost |  | 10,657,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 2,934,000 |  |  |
Reserve for Impairment |  |  |  |  |
NBV Real Estate |  | 7,723,000 |  |  |
Industrial Office Properties [Member] | Genesis Plaza [Member] |  |  |  |  |
Encumbrances |  | 6,378,000 |  |  |
Land, Initial Cost |  | 1,400,000 |  |  |
Building and Improvements, Initial Cost |  | 8,600,000 |  |  |
Acquisition Price |  | 10,000,000 |  |  |
Capitalized Improvements |  | 2,423,000 |  |  |
Land Cost, Total Cost |  | 1,400,000 |  |  |
Building & Improvements, Total Cost |  | 8,071,000 |  |  |
Total cost |  | 11,894,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 3,105,000 |  |  |
Reserve for Impairment |  |  |  |  |
NBV Real Estate |  | 8,789,000 |  |  |
Industrial Office Properties [Member] | Dakota Center [Member] |  |  |  |  |
Encumbrances |  | 10,112,000 |  |  |
Land, Initial Cost |  | 832,000 |  |  |
Building and Improvements, Initial Cost |  | 8,743,000 |  |  |
Acquisition Price |  | 9,575,000 |  |  |
Capitalized Improvements |  | 1,270,000 |  |  |
Land Cost, Total Cost |  | 832,000 |  |  |
Building & Improvements, Total Cost |  | 9,917,000 |  |  |
Total cost |  | 12,019,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 3,165,000 |  |  |
Reserve for Impairment |  |  |  |  |
NBV Real Estate |  | 8,854,000 |  |  |
Industrial Office Properties [Member] | Grand Pacific Center [Member] |  |  |  |  |
Encumbrances |  | 3,852,000 |  |  |
Land, Initial Cost |  | 413,000 |  |  |
Building and Improvements, Initial Cost |  | 4,926,000 |  |  |
Acquisition Price |  | 5,339,000 |  |  |
Capitalized Improvements |  | 872,000 |  |  |
Land Cost, Total Cost |  | 413,000 |  |  |
Building & Improvements, Total Cost |  | 6,099,000 |  |  |
Total cost |  | 7,384,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 1,470,000 |  |  |
Reserve for Impairment |  |  |  |  |
NBV Real Estate |  | 5,914,000 |  |  |
Industrial Office Properties [Member] | Union Terrace [Member] |  |  |  |  |
Encumbrances | [2] | 6,240,000 |  |  |
Land, Initial Cost | [2] | 1,717,000 |  |  |
Building and Improvements, Initial Cost | [2] | 7,708,000 |  |  |
Acquisition Price | [2] | 9,425,000 |  |  |
Capitalized Improvements | [2] | 3,750,000 |  |  |
Land Cost, Total Cost | [2] | 1,717,000 |  |  |
Building & Improvements, Total Cost | [2] | 5,853,000 |  |  |
Total cost | [2] | 11,320,000 |  |  |
Accumulated Depreciation & Depreciation | [1],[2] | 2,895,000 |  |  |
Reserve for Impairment | [2] |  |  |  |
NBV Real Estate | [2] | 8,425,000 |  |  |
Industrial Office Properties [Member] | Centennial Tech Center [Member] |  |  |  |  |
Encumbrances | [2],[3] | 9,562,000 |  |  |
Land, Initial Cost | [2],[3] | 2,025,000 |  |  |
Building and Improvements, Initial Cost | [2],[3] | 13,475,000 |  |  |
Acquisition Price | [2],[3] | 15,500,000 |  |  |
Capitalized Improvements | [2],[3] | 3,545,000 |  |  |
Land Cost, Total Cost | [2],[3] | 2,025,000 |  |  |
Building & Improvements, Total Cost | [2],[3] | 10,556,000 |  |  |
Total cost | [2],[3] | 16,126,000 |  |  |
Accumulated Depreciation & Depreciation | [1],[2],[3] | 2,994,000 |  |  |
Reserve for Impairment | [2],[3] |  |  |  |
NBV Real Estate | [2],[3] | 13,132,000 |  |  |
Industrial Office Properties [Member] | Arapahoe Center [Member] |  |  |  |  |
Encumbrances |  | 8,086,000 |  |  |
Land, Initial Cost |  | 1,420,000 |  |  |
Building and Improvements, Initial Cost |  | 10,430,000 |  |  |
Acquisition Price |  | 11,850,000 |  |  |
Capitalized Improvements |  | 2,076,000 |  |  |
Land Cost, Total Cost |  | 1,420,000 |  |  |
Building & Improvements, Total Cost |  | 8,857,000 |  |  |
Total cost |  | 12,353,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 2,605,000 |  |  |
Reserve for Impairment |  |  |  |  |
NBV Real Estate |  | 9,748,000 |  |  |
Industrial Office Properties [Member] | West Fargo Industrial [Member] |  |  |  |  |
Encumbrances |  | 4,216,000 |  |  |
Land, Initial Cost |  | 1,693,000 |  |  |
Building and Improvements, Initial Cost |  | 6,207,000 |  |  |
Acquisition Price |  | 7,900,000 |  |  |
Capitalized Improvements |  | 234,000 |  |  |
Land Cost, Total Cost |  | 1,693,000 |  |  |
Building & Improvements, Total Cost |  | 6,063,000 |  |  |
Total cost |  | 7,990,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 778,000 |  |  |
Reserve for Impairment |  |  |  |  |
NBV Real Estate |  | 7,212,000 |  |  |
Industrial Office Properties [Member] | The 300 N.P [Member] |  |  |  |  |
Encumbrances |  | 2,312,000 |  |  |
Land, Initial Cost |  | 135,000 |  |  |
Building and Improvements, Initial Cost |  | 3,715,000 |  |  |
Acquisition Price |  | 3,850,000 |  |  |
Capitalized Improvements |  | 317,000 |  |  |
Land Cost, Total Cost |  | 135,000 |  |  |
Building & Improvements, Total Cost |  | 3,589,000 |  |  |
Total cost |  | 4,041,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 636,000 |  |  |
Reserve for Impairment |  |  |  |  |
NBV Real Estate |  | 3,405,000 |  |  |
Industrial Office Properties [Member] | Highland Court [Member] |  |  |  |  |
Encumbrances |  | 6,424,000 |  |  |
Land, Initial Cost |  | 3,608,000 |  |  |
Building and Improvements, Initial Cost |  | 9,442,000 |  |  |
Acquisition Price |  | 13,050,000 |  |  |
Capitalized Improvements |  | 3,384,000 |  |  |
Land Cost, Total Cost |  | 3,608,000 |  |  |
Building & Improvements, Total Cost |  | 7,767,000 |  |  |
Total cost |  | 14,759,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 3,339,000 |  |  |
Reserve for Impairment |  |  |  |  |
NBV Real Estate |  | 11,420,000 |  |  |
Industrial Office Properties [Member] | One Park Centre [Member] |  |  |  |  |
Encumbrances |  | 6,488,000 |  |  |
Land, Initial Cost |  | 1,206,000 |  |  |
Building and Improvements, Initial Cost |  | 7,944,000 |  |  |
Acquisition Price |  | 9,150,000 |  |  |
Capitalized Improvements |  | 1,357,000 |  |  |
Land Cost, Total Cost |  | 1,206,000 |  |  |
Building & Improvements, Total Cost |  | 7,416,000 |  |  |
Total cost |  | 9,979,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 1,460,000 |  |  |
Reserve for Impairment |  |  |  |  |
NBV Real Estate |  | 8,519,000 |  |  |
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 |  | 5,711,000 |  |  |
Land Cost, Total Cost |  | 2,214,000 |  |  |
Building & Improvements, Total Cost |  | 19,515,000 |  |  |
Total cost |  | 27,440,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 5,587,000 |  |  |
Reserve for Impairment |  |  |  |  |
NBV Real Estate |  | 21,853,000 |  |  |
Retail Properties [Member] |  |  |  |  |
Encumbrances |  | 18,506,000 |  |  |
Land, Initial Cost |  | 6,206,000 |  |  |
Building and Improvements, Initial Cost |  | 22,950,000 |  |  |
Acquisition Price |  | 29,156,000 |  |  |
Capitalized Improvements |  | 1,656,000 |  |  |
Land Cost, Total Cost |  | 6,239,000 |  |  |
Building & Improvements, Total Cost |  | 24,408,000 |  |  |
Total cost |  | 32,303,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 5,452,000 |  |  |
Reserve for Impairment |  | 1,533,000 |  |  |
NBV Real Estate |  | 25,318,000 |  |  |
Retail Properties [Member] | World Plaza [Member] |  |  |  |  |
Encumbrances | [2] | 4,979,000 |  |  |
Land, Initial Cost | [2] | 1,698,000 |  |  |
Building and Improvements, Initial Cost | [2] | 6,232,000 |  |  |
Acquisition Price | [2] | 7,930,000 |  |  |
Capitalized Improvements | [2] | 749,000 |  |  |
Land Cost, Total Cost | [2] | 1,698,000 |  |  |
Building & Improvements, Total Cost | [2] | 8,803,000 |  |  |
Total cost | [2] | 11,250,000 |  |  |
Accumulated Depreciation & Depreciation | [1],[2] | 2,246,000 |  |  |
Reserve for Impairment | [2] | 700,000 |  |  |
NBV Real Estate | [2] | 8,304,000 |  |  |
Retail Properties [Member] | Waterman Plaza [Member] |  |  |  |  |
Encumbrances |  | 3,274,000 |  |  |
Land, Initial Cost |  | 2,350,000 |  |  |
Building and Improvements, Initial Cost |  | 4,814,000 |  |  |
Acquisition Price |  | 7,164,000 |  |  |
Capitalized Improvements |  | 239,000 |  |  |
Land Cost, Total Cost |  | 2,383,000 |  |  |
Building & Improvements, Total Cost |  | 4,324,000 |  |  |
Total cost |  | 6,946,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 1,224,000 |  |  |
Reserve for Impairment |  | 833,000 |  |  |
NBV Real Estate |  | 4,889,000 |  |  |
Retail Properties [Member] | Union Town Center [Member] |  |  |  |  |
Encumbrances |  | 8,440,000 |  |  |
Land, Initial Cost |  | 1,750,000 |  |  |
Building and Improvements, Initial Cost |  | 9,462,000 |  |  |
Acquisition Price |  | 11,212,000 |  |  |
Capitalized Improvements |  | 504,000 |  |  |
Land Cost, Total Cost |  | 1,750,000 |  |  |
Building & Improvements, Total Cost |  | 8,932,000 |  |  |
Total cost |  | 11,186,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 1,574,000 |  |  |
Reserve for Impairment |  |  |  |  |
NBV Real Estate |  | 9,612,000 |  |  |
Retail Properties [Member] | Research Parkway [Member] |  |  |  |  |
Encumbrances |  | 1,813,000 |  |  |
Land, Initial Cost |  | 408,000 |  |  |
Building and Improvements, Initial Cost |  | 2,442,000 |  |  |
Acquisition Price |  | 2,850,000 |  |  |
Capitalized Improvements |  | 164,000 |  |  |
Land Cost, Total Cost |  | 408,000 |  |  |
Building & Improvements, Total Cost |  | 2,349,000 |  |  |
Total cost |  | 2,921,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 408,000 |  |  |
Reserve for Impairment |  |  |  |  |
NBV Real Estate |  | 2,513,000 |  |  |
Model Home [Member] |  |  |  |  |
Encumbrances |  | 32,644,000 |  |  |
Land, Initial Cost |  | 9,110,000 |  |  |
Building and Improvements, Initial Cost |  | 46,698,000 |  |  |
Acquisition Price |  | 55,808,000 |  |  |
Land Cost, Total Cost |  | 8,681,000 |  |  |
Building & Improvements, Total Cost |  | 41,706,000 |  |  |
Total cost |  | 50,387,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 1,920,000 |  |  |
NBV Real Estate |  | 48,467,000 |  |  |
Model Home [Member] | Model Homes -NDMHR, LP [Member] |  |  |  |  |
Encumbrances |  | 2,840,000 |  |  |
Land, Initial Cost |  | 1,387,000 |  |  |
Building and Improvements, Initial Cost |  | 7,019,000 |  |  |
Acquisition Price |  | 8,406,000 |  |  |
Land Cost, Total Cost |  | 984,000 |  |  |
Building & Improvements, Total Cost |  | 4,331,000 |  |  |
Total cost |  | 5,315,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 339,000 |  |  |
NBV Real Estate |  | 4,976,000 |  |  |
Model Home [Member] | Model Homes-DMH LP #202 [Member] |  |  |  |  |
Encumbrances |  | 4,784,000 |  |  |
Land, Initial Cost |  | 1,384,000 |  |  |
Building and Improvements, Initial Cost |  | 7,381,000 |  |  |
Acquisition Price |  | 8,765,000 |  |  |
Land Cost, Total Cost |  | 1,152,000 |  |  |
Building & Improvements, Total Cost |  | 6,332,000 |  |  |
Total cost |  | 7,484,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 378,000 |  |  |
NBV Real Estate |  | 7,106,000 |  |  |
Model Home [Member] | Model Homes-DMH LP #203 [Member] |  |  |  |  |
Encumbrances |  | 8,650,000 |  |  |
Land, Initial Cost |  | 1,911,000 |  |  |
Building and Improvements, Initial Cost |  | 10,220,000 |  |  |
Acquisition Price |  | 12,131,000 |  |  |
Land Cost, Total Cost |  | 2,359,000 |  |  |
Building & Improvements, Total Cost |  | 10,803,000 |  |  |
Total cost |  | 13,162,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 513,000 |  |  |
NBV Real Estate |  | 12,649,000 |  |  |
Model Home [Member] | Model Homes-DMH LP #204 [Member] |  |  |  |  |
Encumbrances |  | 5,851,000 |  |  |
Land, Initial Cost |  | 1,409,000 |  |  |
Building and Improvements, Initial Cost |  | 6,522,000 |  |  |
Acquisition Price |  | 7,931,000 |  |  |
Land Cost, Total Cost |  | 1,545,000 |  |  |
Building & Improvements, Total Cost |  | 7,209,000 |  |  |
Total cost |  | 8,754,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 271,000 |  |  |
NBV Real Estate |  | 8,483,000 |  |  |
Model Home [Member] | Model Homes-DMH LP #205 [Member] |  |  |  |  |
Encumbrances |  | 3,687,000 |  |  |
Land, Initial Cost |  | 1,021,000 |  |  |
Building and Improvements, Initial Cost |  | 4,309,000 |  |  |
Acquisition Price |  | 5,330,000 |  |  |
Land Cost, Total Cost |  | 1,021,000 |  |  |
Building & Improvements, Total Cost |  | 4,309,000 |  |  |
Total cost |  | 5,330,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 35,000 |  |  |
NBV Real Estate |  | 5,295,000 |  |  |
Model Home [Member] | Model Homes-NMH Inc. [Member] |  |  |  |  |
Encumbrances |  | 6,832,000 |  |  |
Land, Initial Cost |  | 1,998,000 |  |  |
Building and Improvements, Initial Cost |  | 11,247,000 |  |  |
Acquisition Price |  | 13,245,000 |  |  |
Land Cost, Total Cost |  | 1,620,000 |  |  |
Building & Improvements, Total Cost |  | 8,722,000 |  |  |
Total cost |  | 10,342,000 |  |  |
Accumulated Depreciation & Depreciation | [1] | 384,000 |  |  |
NBV Real Estate |  | $ 9,958,000 |  |  |
[1] | Depreciation is computed on a straight-line basis using useful lives up to 39 years.
[2] | Property held for sale as of December 31, 2019.
[3] | Centennial Tech Center sold for approximately $15.0 million on February 5, 2020.

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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 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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