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Note 4 - Real Estate Assets - Summary of Properties Owned (Details) - USD ($) | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Real estate assets owned | $ 176,516,000 |  | $ 200,207 |  | $ 211,108 |
Garden Gateway Plaza [Member] |  |  |  |  |  |
Geographic location | Colorado Springs, Colorado | [1] | Colorado Springs, Colorado | [2] |  |
Real estate assets owned | $ 11,445,000 | [1] | $ 11,428,000 | [2] | 11,166,000 | [2]
World Plaza [Member] |  |  |  |  |  |
Geographic location | San Bernardino, California | [1] | San Bernardino, California | [2] |  |
Real estate assets owned | $ 9,271,000 | [1] | $ 8,305,000 | [2] | 6,180,000 | [2]
Executive Office Park [Member] |  |  |  |  |  |
Geographic location | Colorado Springs, Colorado | [3] | Colorado Springs, Colorado |  |  |
Real estate assets owned | $ 7,623,000 | [3] | $ 7,723,000 |  | 7,976,000 |
Waterman Plaza [Member] |  |  |  |  |  |
Geographic location | San Bernardino, California |  | San Bernardino, California |  |  |
Real estate assets owned | $ 4,000,000 |  | $ 4,889,000 |  | 4,977,000 |
Genesis Plaza [Member] |  |  |  |  |  |
Geographic location | San Diego, California |  | San Diego, California |  |  |
Real estate assets owned | $ 8,947,000 |  | $ 8,789,000 |  | 8,449,000 |
Dakota Center [Member] |  |  |  |  |  |
Geographic location | Fargo, North Dakota |  | Fargo, North Dakota |  |  |
Real estate assets owned | $ 8,724,000 |  | $ 8,855,000 |  | 9,139,000 |
Grand Pacific Center [Member] |  |  |  |  |  |
Geographic location | Bismarck, North Dakota |  | Bismarck, North Dakota |  |  |
Real estate assets owned | $ 5,823,000 |  | $ 5,914,000 |  | 5,814,000 |
Arapahoe Center [Member] |  |  |  |  |  |
Geographic location | Centennial, Colorado |  | Centennial, Colorado |  |  |
Real estate assets owned | $ 9,492,000 |  | $ 9,748,000 |  | 10,251,000 |
Union Town Center [Member] |  |  |  |  |  |
Geographic location | Colorado Springs, Colorado |  | Colorado Springs, Colorado |  |  |
Real estate assets owned | $ 9,482,000 |  | $ 9,612,000 |  | 9,904,000 |
West Fargo Industrial [Member] |  |  |  |  |  |
Geographic location | West Fargo, North Dakota |  | Fargo, North Dakota |  |  |
Real estate assets owned | $ 7,136,000 |  | $ 7,212,000 |  | 7,243,000 |
The 300 N.P [Member] |  |  |  |  |  |
Geographic location | Fargo, North Dakota |  | Fargo, North Dakota |  |  |
Real estate assets owned | $ 3,336,000 |  | $ 3,405,000 |  | 3,543,000 |
Research Parkway [Member] |  |  |  |  |  |
Geographic location | Colorado Springs, Colorado |  | Colorado Springs, Colorado |  |  |
Real estate assets owned | $ 2,473,000 |  | $ 2,512,000 |  | 2,589,000 |
One Park Centre [Member] |  |  |  |  |  |
Geographic location | Westminster, Colorado |  | Westminster, Colorado |  |  |
Real estate assets owned | $ 8,789,000 |  | $ 8,518 |  | 8,453 |
Highland Court [Member] |  |  |  |  |  |
Geographic location | Centennial, Colorado |  | Centennial, Colorado |  |  |
Real estate assets owned | $ 11,136,000 |  | $ 11,421,000 |  | 11,845,000 |
Shea Center II [Member] |  |  |  |  |  |
Geographic location | Highlands Ranch, Colorado |  | Highlands Ranch, Colorado |  |  |
Real estate assets owned | $ 21,470,000 |  | $ 21,853,000 |  | 22,658,000 |
Presidio Property Trust, Inc. Properties [Member] |  |  |  |  |  |
Real estate assets owned | 129,147,000 |  |  |  |  |
Model Home Properties [Member] |  |  |  |  |  |
Real estate assets owned | $ 47,369,000 | [4] | $ 48,466,000 |  | $ 48,763,000 |
[1] | Properties held for sale as of June 30, 2020.
[2] | Property held for sale as of December 31, 2019.
[3] | One of the four buildings at the property is held for sale as of June 30, 2020.
[4] | Includes four Model Homes that are listed as held for sale as of June 30, 2020.

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