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Note 7 - Mortgage Notes Payable - Mortgage Notes Payable (Details) - USD ($)

6 Months Ended

12 Months Ended

Jun. 30, 2020

Dec. 31, 2019

Dec. 31, 2018

Mortgage Notes Payable, net

$ 125,530,928

$ 142,392,992

$ 149,714,176

Mortgage Notes [Member]

Mortgage Notes Payable

126,442,100

143,459,048

151,140,916

Unamortized loan costs

(911,172)

(1,066,056)

(1,426,740)

Waterman Plaza [Member] | Mortgage Notes [Member]

Mortgage Notes Payable

$ 3,247,878

^[1]

$ 3,274,097

^[1]

3,369,960

Interest rate, variable

^[1],[2]

4.25%

Maturity date

Apr. 29, 2021

^[1]

Apr. 29, 2021

Interest rate

^[3]

5.78%

World Plaza [Member] | Mortgage Notes [Member]

Mortgage Notes Payable

$ 5,854,222

^[4],[5]

$ 4,979,383

^[4],[5],[6]

3,350,539

^[6]

Interest rate, variable

4.40%

^[2],[4],[5]

5.10%

^[3],[6]

Maturity date

Jul. 05, 2021

^[4],[5]

Jul. 05, 2020

Garden Gateway Plaza [Member] | Mortgage Notes [Member]

Mortgage Notes Payable

$ 5,967,727

^[5]

$ 6,071,315

^[5],[7]

6,270,896

^[7]

Maturity date

Aug. 05, 2021

^[5]

Feb. 05, 2020

Interest rate

5.00%

^[2],[5]

5.00%

^[3],[7]

The 300 N.P [Member] | Mortgage Notes [Member]

Mortgage Notes Payable

$ 2,292,848

$ 2,311,738

2,348,443

Maturity date

Jun. 11, 2022

Jun. 11, 2022

Interest rate

4.95%

^[2]

4.95%

^[3]

Highland Court [Member] | Mortgage Notes [Member]

Mortgage Notes Payable

$ 6,350,303

$ 6,424,366

6,568,320

Maturity date

Sep. 01, 2022

Sep. 01, 2022

Interest rate

3.82%

^[2]

3.82%

^[3]

Dakota Center [Member] | Mortgage Notes [Member]

Mortgage Notes Payable

$ 10,007,257

$ 10,111,693

10,314,520

Maturity date

Jul. 06, 2024

Jul. 06, 2024

Interest rate

4.74%

^[2]

4.74%

^[3]

Union Terrace [Member] | Mortgage Notes [Member]

Mortgage Notes Payable

^[8]

$ 6,240,396

^[8]

6,354,153

Maturity date

Sep. 05, 2024

^[8]

Sep. 05, 2024

Interest rate

4.50%

^[2],[8]

4.50%

^[3]

Centennial Tech Center [Member] | Mortgage Notes [Member]

Mortgage Notes Payable

^[8]

$ 9,561,654

^[8],[9]

9,745,811

^[9]

Maturity date

Jan. 05, 2024

^[8]

Jan. 05, 2024

Interest rate

4.43%

^[2],[8]

4.43%

^[3],[9]

Research Parkway [Member] | Mortgage Notes [Member]

Mortgage Notes Payable

$ 1,787,129

$ 1,813,305

1,864,139

Maturity date

Jan. 05, 2025

Jan. 05, 2025

Interest rate

3.94%

^[2]

3.94%

^[3]

Arapahoe Center [Member] | Mortgage Notes [Member]

Mortgage Notes Payable

$ 8,009,836

$ 8,085,727

8,233,567

Maturity date

Jan. 05, 2025

Jan. 05, 2025

Interest rate

4.34%

^[2]

4.34%

^[3]

Union Town Center [Member] | Mortgage Notes [Member]

Mortgage Notes Payable

$ 8,406,185

$ 8,440,000

8,440,000

Maturity date

Jan. 05, 2025

Jan. 05, 2025

Interest rate

4.28%

^[2]

4.28%

^[3]

Executive Office Park [Member] | Mortgage Notes [Member]

Mortgage Notes Payable

$ 4,783,471

^[5]

$ 4,839,576

^[5]

4,947,808

Maturity date

Jun. 01, 2027

^[5]

Jun. 01, 2027

Interest rate

4.83%

^[2],[5]

4.83%

^[3]

Genesis Plaza [Member] | Mortgage Notes [Member]

Mortgage Notes Payable

$ 6,327,800

$ 6,378,110

6,476,032

Maturity date

Sep. 06, 2025

Aug. 25, 2025

Interest rate

4.71%

^[2]

4.71%

^[3]

One Park Centre [Member] | Mortgage Notes [Member]

Mortgage Notes Payable

$ 6,436,968

$ 6,487,532

6,585,922

Maturity date

Sep. 05, 2025

Sep. 05, 2025

Interest rate

4.77%

^[2]

4.77%

^[3]

Shea Center II [Member] | Mortgage Notes [Member]

Mortgage Notes Payable

$ 17,727,500

$ 17,727,500

17,727,500

Maturity date

Jan. 05, 2026

Jan. 05, 2026

Interest rate

4.92%

^[2]

4.92%

^[3]

West Fargo Industrial [Member] | Mortgage Notes [Member]

Mortgage Notes Payable

$ 4,177,324

$ 4,216,565

4,292,809

Maturity date

May 31, 2029

Sep. 06, 2020

Interest rate

4.79%

^[2]

4.79%

^[3]

Grand Pacific Center [Member] | Mortgage Notes [Member]

Mortgage Notes Payable

$ 3,795,623

^[10]

$ 3,851,962

^[10],[11]

$ 3,961,304

^[11]

Maturity date

Aug. 01, 2037

^[10]

Aug. 01, 2037

Interest rate

4.02%

^[2],[10]

4.02%

^[3],[11]

Subtotal, Presidio Property Trust, Inc. Properties [Member] | Mortgage Notes [Member]

Mortgage Notes Payable

$ 95,172,071

$ 110,814,919

Model Home [Member] | Mortgage Notes [Member]

Mortgage Notes Payable

^[5]

$ 31,270,029

$ 32,644,129

[1]	Interest on this loan resets annually at LIBOR plus 3.00%, with a floor of 4.25%.
[2]	Interest rates as of June 30, 2020.
[3]	Interest rates as of December 31, 2019.
[4]	Interest rate is subject to reset on September 1, 2023.
[5]	Properties held for sale as of June 30, 2020. Only one of the four buildings at Executive Office Park was classified as held for sale. There are four model homes included as held for sale.
[6]	Interest on this loan is ABR + 0.75% and LIBOR plus 2.75% For the year-ended December 31, 2019, the weighted average interest rate was 5.04%.
[7]	The maturity date of the mortgage loan was extended to August 5, 2021.
[8]	Centennial Tech Center and Union Terrace were sold on February 5, 2020 and March 13, 2020, respectively.
[9]	Centennial Tech Center was held for sale as of December 31, 2019 and sold for approximately $15.0 million on February 5, 2020.
[10]	Interest on this loan is alternative base rate plus 0.75% and LIBOR plus 2.75%. For the six months ended June 30, 2020, the weighted average interest rate was 4.40%.
[11]	Interest rate is subject to reset on September 1, 2023.

X

- Definition

The variable percentage of interest rate on debt instrument.

+ References

No definition available.

+ Details

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X

- Definition

Amount of net mortgage notes payable.

+ References

No definition available.

+ Details

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X

- Definition

The amount of notes payable including unamortized cost.

+ References

No definition available.

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X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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X

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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X

- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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