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Mortgage Notes Payable (Details) - USD ($)

6 Months Ended

Jun. 30, 2018

Dec. 31, 2017

Debt Instrument [Line Items]

Mortgage notes payable

$ 172,385,190

$ 162,005,679

Unamortized loan costs

(1,760,341)

(1,682,942)

Mortgage notes payable, net

170,624,849

160,322,737

Bismarck Office Building [Member]

Debt Instrument [Line Items]

Mortgage notes payable

^[1]

$ 4,005,584

4,057,752

Fixed interest rate on mortgage (in hundredths)

^[1],[2]

4.02%

Maturity date

^[1]

Aug. 01, 2037

World Plaza [Member]

Debt Instrument [Line Items]

Mortgage notes payable

^[3]

$ 6,046,000

Maturity date

^[3]

Jun. 05, 2020

Variable interest rate on mortgage (in hundredths)

^[2],[3]

4.83%

Port of San Diego Complex [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 9,432,077

9,575,508

Fixed interest rate on mortgage (in hundredths)

^[2]

4.75%

Maturity date

Mar. 05, 2020

Garden Gateway Plaza [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 6,351,160

6,445,300

Fixed interest rate on mortgage (in hundredths)

^[2]

5.00%

Maturity date

Apr. 05, 2020

West Fargo Industrial [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 4,329,281

4,365,449

Fixed interest rate on mortgage (in hundredths)

^[2]

4.79%

Maturity date

Aug. 04, 2020

Morena Office Center [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 2,120,141

2,156,479

Fixed interest rate on mortgage (in hundredths)

^[2]

4.30%

Maturity date

Jun. 01, 2021

Waterman Plaza [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 3,806,950

3,850,365

Fixed interest rate on mortgage (in hundredths)

^[2]

4.25%

Maturity date

Apr. 29, 2021

Pacific Oaks Plaza [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 1,441,642

1,466,351

Fixed interest rate on mortgage (in hundredths)

^[2]

4.50%

Maturity date

Jun. 01, 2021

Highland Court [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 6,626,699

6,695,541

Fixed interest rate on mortgage (in hundredths)

^[2]

3.82%

Maturity date

Aug. 28, 2022

Dakota Bank Buildings [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 10,394,947

10,492,904

Fixed interest rate on mortgage (in hundredths)

^[2]

4.74%

Maturity date

Jul. 06, 2024

Union Terrace Building [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 6,399,308

6,454,448

Fixed interest rate on mortgage (in hundredths)

^[2]

4.50%

Maturity date

Sep. 05, 2024

The Presidio [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 6,000,000

6,000,000

Fixed interest rate on mortgage (in hundredths)

^[2]

4.54%

Maturity date

Dec. 01, 2024

Research Parkway [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 1,884,737

1,909,012

Fixed interest rate on mortgage (in hundredths)

^[2]

3.94%

Maturity date

Jan. 05, 2025

Centennial Tech Center [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 9,819,029

9,908,235

Fixed interest rate on mortgage (in hundredths)

^[2]

4.43%

Maturity date

Jan. 05, 2025

Arapahoe Service Center [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 8,292,356

8,364,088

Fixed interest rate on mortgage (in hundredths)

^[2]

4.34%

Maturity date

Jan. 05, 2025

Union Town Center [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 8,440,000

8,440,000

Fixed interest rate on mortgage (in hundredths)

^[2]

4.28%

Maturity date

Jan. 05, 2025

Yucca Valley Retail Center [Member]

Debt Instrument [Line Items]

Mortgage notes payable

^[4]

$ 5,976,099

6,000,000

Fixed interest rate on mortgage (in hundredths)

^[2],[4]

4.30%

Maturity date

^[4]

Apr. 11, 2025

Executive Office Park [Member]

Debt Instrument [Line Items]

Mortgage notes payable

^[5]

$ 4,991,389

4,151,161

Fixed interest rate on mortgage (in hundredths)

^[2],[5]

5.80%

Maturity date

^[5]

Jul. 01, 2025

Genesis Plaza [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 6,500,000

6,500,000

Fixed interest rate on mortgage (in hundredths)

^[2]

4.65%

Maturity date

Aug. 25, 2025

One Park Centre [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 6,610,000

6,610,000

Fixed interest rate on mortgage (in hundredths)

^[2]

4.77%

Maturity date

Sep. 05, 2025

Shea Center II [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 17,727,500

17,727,500

Fixed interest rate on mortgage (in hundredths)

^[2]

4.92%

Maturity date

Jan. 05, 2026

300 N.P. [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 2,362,903

2,380,703

Fixed interest rate on mortgage (in hundredths)

^[2]

4.95%

Maturity date

Jun. 11, 2022

Presidio Property Trust, Inc Properties [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 139,557,802

133,550,796

Fixed interest rate on mortgage (in hundredths)

^[2]

4.71%

Model Home Properties [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 32,827,388

$ 28,454,883

Model Home Properties [Member] | Minimum [Member]

Debt Instrument [Line Items]

Fixed interest rate on mortgage (in hundredths)

3.80%

Maturity date

^[6]

Jan. 01, 2018

Model Home Properties [Member] | Maximum [Member]

Debt Instrument [Line Items]

Fixed interest rate on mortgage (in hundredths)

5.50%

Maturity date

^[6]

Jan. 01, 2021

[1]	Interest rate is subject to reset on September 1, 2023 and on September 1, 2030.
[2]	Interest rates as of June 30, 2018.
[3]	Interest rate is Libor plus 2.75% or 4.83% as of June 30, 2018.
[4]	Properties held for sale as of June 30, 2018.
[5]	Interest rate is subject to reset on June 1, 2021 and June 1, 2024
[6]	Each Model Home has a stand-alone mortgage note at interest rates ranging from 3.8% to 5.5% per annum (at June 30, 2018).

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Notes Payable Including Unamortized Cost.

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Contractual interest rate for funds borrowed, under the debt agreement.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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