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Mortgage Notes Payable (Details) - USD ($)

3 Months Ended

Mar. 31, 2018

Dec. 31, 2017

Debt Instrument [Line Items]

Mortgage notes payable

$ 165,845,811

$ 162,005,679

Unamortized loan costs

(1,749,375)

(1,682,942)

Mortgage notes payable, net

164,096,436

160,322,737

Bismarck Office Building [Member]

Debt Instrument [Line Items]

Mortgage notes payable

^[1]

$ 4,031,799

17,727,500

Fixed interest rate on mortgage (in hundredths)

^[1],[2]

4.02%

Maturity date

^[1]

Aug. 01, 2037

Port of San Diego Complex [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 9,504,218

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

$ 6,398,524

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

$ 4,346,902

4,365,449

Fixed interest rate on mortgage (in hundredths)

^[2]

4.79%

Maturity date

Sep. 06, 2020

Morena Office Center [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 2,138,281

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

$ 3,827,296

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

$ 1,453,977

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

$ 6,661,284

6,695,541

Fixed interest rate on mortgage (in hundredths)

^[2]

3.82%

Maturity date

Sep. 01, 2022

Dakota Bank Buildings [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 10,443,530

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

$ 6,426,632

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

2,380,703

Fixed interest rate on mortgage (in hundredths)

^[2]

4.54%

Maturity date

Dec. 01, 2021

Research Parkway [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 1,896,934

9,908,235

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

$ 9,863,274

6,000,000

Fixed interest rate on mortgage (in hundredths)

^[2]

4.43%

Maturity date

Nov. 05, 2024

Arapahoe Service Center [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 8,327,915

1,909,012

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

8,364,088

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

^[3]

$ 6,000,000

8,440,000

Fixed interest rate on mortgage (in hundredths)

^[2],[3]

4.30%

Maturity date

^[3]

Apr. 11, 2025

Executive Office Park [Member]

Debt Instrument [Line Items]

Mortgage notes payable

^[4]

$ 4,129,436

6,000,000

Fixed interest rate on mortgage (in hundredths)

^[2],[4]

5.80%

Maturity date

^[4]

Jul. 01, 2025

Genesis Plaza [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 6,500,000

4,151,161

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

6,500,000

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

6,610,000

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

$ 2,371,695

4,057,752

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

$ 133,099,197

133,550,796

Fixed interest rate on mortgage (in hundredths)

^[2]

4.71%

Model Home Properties [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 32,746,614

$ 28,454,883

Model Home Properties [Member] | Minimum [Member]

Debt Instrument [Line Items]

Fixed interest rate on mortgage (in hundredths)

3.80%

Maturity date

^[5]

Jan. 01, 2018

Model Home Properties [Member] | Maximum [Member]

Debt Instrument [Line Items]

Fixed interest rate on mortgage (in hundredths)

5.50%

Maturity date

^[5]

Jan. 01, 2020

[1]	Interest rate is subject to reset on September 1, 2023 and on September 1, 2030.
[2]	Interest rates as of March 31, 2018.
[3]	Property held for sale as of March 31, 2018.
[4]	Interest rate is subject to reset on July 1, 2018
[5]	Each Model Home has a stand-alone mortgage note at interest rates ranging from 3.8% to 5.5% per annum (at March 31, 2018).

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Notes Payable Including Unamortized Cost.

+ References

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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=6877327&loc=d3e13212-122682

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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/presentationRef
-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=6877327&loc=d3e13212-122682

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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=6877327&loc=d3e13212-122682

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