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Mortgage Notes Payable (Detail) - USD ($) | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage notes payable |  | $ 164,701,057 |  | $ 160,828,604 |  | $ 144,690,570 |
Unamortized loan costs |  | (1,781,974) |  | (1,942,493) |  | (2,052,169) |
Mortgage notes payable, net |  | 162,919,083 |  | 158,886,111 |  | 142,638,401 |
Executive Office Park [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage notes payable | [1] | $ 4,171,269 |  | $ 4,231,842 |  | 4,307,975 |
Fixed interest rate on mortgage (in hundredths) |  | 5.80% | [2] | 5.80% | [3] |  |
Maturity date |  | Jul. 01, 2025 |  | Jul. 01, 2025 |  |  |
Rangewood Medical Office Building [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage notes payable |  |  |  | $ 958,106 |  | 1,027,085 |
Fixed interest rate on mortgage (in hundredths) |  | 4.95% | [2] | 4.95% | [3] |  |
Maturity date |  | Jan. 01, 2019 |  | Jan. 01, 2019 |  |  |
Regatta Square [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage notes payable |  |  |  | $ 1,150,566 |  | 1,183,473 |
Fixed interest rate on mortgage (in hundredths) |  | 4.95% | [2] | 4.95% | [3] |  |
Maturity date |  | Jan. 01, 2019 |  | Jan. 01, 2019 |  |  |
Garden Gateway Plaza [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage notes payable |  | $ 6,491,497 |  | $ 6,626,739 |  | 6,799,229 |
Fixed interest rate on mortgage (in hundredths) |  | 5.00% | [2] | 5.00% | [3] |  |
Maturity date |  | Feb. 05, 2020 |  | Apr. 05, 2020 |  |  |
Port of San Diego Complex [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage notes payable |  | $ 9,645,958 |  | $ 9,852,456 |  | 10,097,726 |
Fixed interest rate on mortgage (in hundredths) |  | 4.75% | [2] | 4.75% | [3] |  |
Maturity date |  | Mar. 05, 2020 |  | Mar. 05, 2020 |  |  |
West Fargo Industrial [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage notes payable |  | $ 4,383,209 |  | $ 4,434,655 |  | 4,500,000 |
Fixed interest rate on mortgage (in hundredths) |  | 4.79% | [2] | 4.79% | [3] |  |
Maturity date |  | Aug. 04, 2020 |  | Aug. 04, 2020 |  |  |
Morena Office Center [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage notes payable |  | $ 2,173,577 | [4] | $ 2,224,839 | [4],[5] | 2,289,899 | [5]
Fixed interest rate on mortgage (in hundredths) |  | 4.50% | [2] | 4.50% | [3] |  |
Maturity date |  | Jan. 01, 2021 |  | Jan. 01, 2021 |  |  |
Waterman Plaza [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage notes payable |  | $ 3,872,112 |  | $ 3,939,037 | [6] |  |
Fixed interest rate on mortgage (in hundredths) |  | 4.25% | [2] | 4.25% | [3] |  |
Maturity date |  | Apr. 29, 2021 |  | Apr. 29, 2021 |  |  |
Pacific Oaks Plaza [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage notes payable |  | $ 1,477,981 |  | $ 1,512,640 |  | 1,556,891 |
Fixed interest rate on mortgage (in hundredths) |  | 4.50% | [2] | 4.50% | [3] |  |
Maturity date |  | Jun. 01, 2021 |  | Jun. 01, 2021 |  |  |
The Presidio [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage notes payable |  | $ 6,000,000 |  | $ 6,000,000 |  | 6,000,000 |
Fixed interest rate on mortgage (in hundredths) |  | 4.54% | [2] | 4.54% | [3] |  |
Maturity date |  | Dec. 01, 2021 |  | Dec. 01, 2024 |  |  |
Shoreline Medical Building [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage notes payable | [5] |  |  | $ 3,602,238 |  | 3,727,569 |
Fixed interest rate on mortgage (in hundredths) |  | 5.10% | [2] | 5.10% | [3] |  |
Maturity date |  | Jun. 01, 2022 |  | Jun. 01, 2022 |  |  |
Highland Court [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage notes payable |  | $ 6,729,472 |  | $ 6,829,348 |  | 6,958,147 |
Fixed interest rate on mortgage (in hundredths) |  | 3.82% | [2] | 3.82% | [3] |  |
Maturity date |  | Sep. 01, 2022 |  | Aug. 28, 2022 |  |  |
Dakota Bank Buildings [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage notes payable |  | $ 10,538,950 |  | $ 10,677,761 |  | 10,825,201 |
Fixed interest rate on mortgage (in hundredths) |  | 4.74% | [2] | 4.74% | [3] |  |
Maturity date |  | Jul. 06, 2024 |  | Jul. 06, 2024 |  |  |
Union Terrace [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage notes payable |  | $ 6,480,347 |  | $ 6,558,704 |  | 6,600,000 |
Fixed interest rate on mortgage (in hundredths) |  | 4.50% | [2] | 4.50% | [3] |  |
Maturity date |  | Sep. 05, 2024 |  | Sep. 05, 2024 |  |  |
Centennial Tech Center [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage notes payable |  | $ 9,950,275 |  | $ 10,077,242 |  | 10,237,591 |
Fixed interest rate on mortgage (in hundredths) |  | 4.34% | [2] | 4.34% | [3] |  |
Maturity date |  | Nov. 05, 2024 |  | Jan. 05, 2025 |  |  |
Research Parkway [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage notes payable |  | $ 1,920,972 |  | $ 1,956,154 |  |  |
Fixed interest rate on mortgage (in hundredths) |  | 3.94% | [2] | 3.94% | [3] |  |
Maturity date |  | Jan. 05, 2025 |  | Jan. 05, 2025 |  |  |
Arapahoe Service Center [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage notes payable |  | $ 8,397,863 |  | $ 8,500,000 |  | 8,500,000 |
Fixed interest rate on mortgage (in hundredths) |  | 4.34% | [2] | 4.34% | [3] |  |
Maturity date |  | Jan. 05, 2025 |  | Jan. 05, 2025 |  |  |
Union Town Center [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage notes payable |  | $ 8,440,000 |  | $ 8,440,000 |  | 8,440,000 |
Fixed interest rate on mortgage (in hundredths) |  | 4.28% | [2] | 4.28% | [3] |  |
Maturity date |  | Jan. 05, 2025 |  | Jan. 05, 2025 |  |  |
Yucca Valley Retail Center [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage notes payable |  | $ 6,000,000 |  | $ 6,000,000 |  | 6,000,000 |
Fixed interest rate on mortgage (in hundredths) |  | 4.30% | [2] | 4.30% | [3] |  |
Maturity date |  | Apr. 11, 2025 |  | Apr. 11, 2025 |  |  |
Genesis Plaza [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage notes payable |  | $ 6,500,000 |  | $ 6,610,000 |  | 6,500,000 |
Fixed interest rate on mortgage (in hundredths) |  | 4.65% | [2] | 4.65% | [3] |  |
Maturity date |  | Aug. 25, 2025 |  | Aug. 25, 2025 |  |  |
One Park Centre [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage notes payable |  | $ 6,610,000 |  | $ 6,500,000 |  | 6,610,000 |
Fixed interest rate on mortgage (in hundredths) |  | 4.77% | [2] | 4.77% | [3] |  |
Maturity date |  | Sep. 05, 2025 |  | Sep. 05, 2025 |  |  |
Shea Center II [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage notes payable |  | $ 17,727,500 |  | $ 17,727,500 |  | 17,727,500 |
Fixed interest rate on mortgage (in hundredths) |  | 4.92% | [2] | 4.92% | [3] |  |
Maturity date |  | Jan. 05, 2026 |  | Jan. 05, 2026 |  |  |
Bismarck Office Building [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage notes payable |  | $ 4,083,446 | [7] | $ 4,158,998 | [7],[8] | 3,252,016 | [8]
Fixed interest rate on mortgage (in hundredths) |  | 4.02% | [2] | 4.02% | [3] |  |
Maturity date |  | Aug. 01, 2037 |  | Aug. 01, 2037 |  |  |
300 N.P. [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage notes payable |  | $ 2,388,948 |  |  |  |  |
Fixed interest rate on mortgage (in hundredths) | [2] | 4.02% |  |  |  |  |
Maturity date |  | Aug. 01, 2037 |  |  |  |  |
Model Home Properties [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage notes payable |  | $ 30,717,681 |  | $ 22,259,779 |  | 9,050,268 |
Model Home Properties [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Fixed interest rate on mortgage (in hundredths) |  | 3.80% |  | 3.80% |  |  |
Maturity date |  | Jan. 01, 2017 | [9] | Jan. 01, 2016 | [10] |  |
Model Home Properties [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Fixed interest rate on mortgage (in hundredths) |  | 5.50% |  | 5.50% |  |  |
Maturity date |  | Jan. 01, 2020 | [9] | Jan. 01, 2020 | [10] |  |
Presidio Property Trust, Inc Properties [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage notes payable |  | $ 133,983,376 |  | $ 138,568,825 |  | 135,640,302 |
Fixed interest rate on mortgage (in hundredths) |  | 4.71% | [2] | 4.71% | [3] |  |
Havana/ Parker Complex [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage notes payable |  |  |  |  |  | $ 2,500,000 |
Fixed interest rate on mortgage (in hundredths) | [3] |  |  | 6.51% |  |  |
Maturity date |  |  |  | Jul. 01, 2016 |  |  |
[1] | Interest rate is subject to reset on July 1, 2018.
[2] | Interest rates as of September 30, 2017.
[3] | Interest rates as of December 31, 2016.
[4] | Interest rate is subject to reset on May 4, 2018.
[5] | Interest rate subject to resetting on the 6th loan anniversary.
[6] | Interest rate is subject to reset on April 28, 2017.
[7] | Interest rate is subject to reset on September 1, 2023 and on September 1, 2030.
[8] | Interest rate is subject to reset on September 1, 2023.
[9] | Each Model Home has a stand-alone mortgage note at interest rates ranging from 3.8% to 5.5% per annum (at September 30, 2017).
[10] | Each Model Home has a standalone mortgage note at interest rates ranging from 3.8% to 5.5% (at December 31, 2016).

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