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

12 Months Ended

Dec. 31, 2021

Dec. 31, 2020

Mortgage Notes Payable, net

$ 88,859,832

$ 120,029,696

Mortgage Notes [Member]

Mortgage Notes Payable

89,422,132

120,788,005

Unamortized loan costs

(562,300)

(758,309)

Mortgage Notes [Member] | Waterman Plaza [Member]

Mortgage Notes Payable

^[1]

0

3,207,952

Mortgage Notes [Member] | World Plaza [Member]

Mortgage Notes Payable

^[2],[3]

0

5,802,568

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

Mortgage Notes Payable

^[1]

0

5,861,523

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

Mortgage Notes Payable

^[4]

$ 2,232,923

2,273,478

Interest rate

^[4],[5]

4.95%

Maturity date

^[4]

Jun. 11, 2022

Mortgage Notes [Member] | Highland Court [Member]

Mortgage Notes Payable

^[1]

$ 0

6,274,815

Interest rate

^[1],[5]

3.82%

Mortgage Notes [Member] | Dakota Center [Member]

Mortgage Notes Payable

$ 9,677,108

9,900,279

Interest rate

^[5]

4.74%

Maturity date

Jul. 06, 2024

Mortgage Notes [Member] | Research Parkway [Member]

Mortgage Notes Payable

$ 1,705,438

1,760,432

Interest rate

^[5]

3.94%

Maturity date

Jan. 05, 2025

Mortgage Notes [Member] | Arapahoe Center [Member]

Mortgage Notes Payable

$ 7,770,887

7,932,255

Interest rate

^[5]

4.34%

Maturity date

Jan. 05, 2025

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

Mortgage Notes Payable

$ 8,173,568

8,315,550

Interest rate

^[5]

4.28%

Maturity date

Jan. 05, 2025

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

Mortgage Notes Payable

$ 6,276,849

6,385,166

Interest rate

^[5]

4.77%

Maturity date

Sep. 05, 2025

Mortgage Notes [Member] | Genesis Plaza [Member]

Mortgage Notes Payable

$ 6,168,604

6,276,273

Interest rate

^[5]

4.71%

Maturity date

Sep. 06, 2025

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

Mortgage Notes Payable

$ 17,494,527

17,727,500

Interest rate

^[5]

4.92%

Maturity date

Jan. 05, 2026

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

Mortgage Notes Payable

^[1]

$ 0

2,985,998

Interest rate

^[1],[5]

4.83%

Maturity date

^[1]

Jun. 01, 2027

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

Mortgage Notes Payable

$ 4,148,405

4,262,718

Interest rate

^[5]

3.27%

Maturity date

Aug. 05, 2029

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

Mortgage Notes Payable

^[6],[7]

$ 3,619,695

3,738,142

Interest rate

^[5],[6],[7]

4.02%

Maturity date

^[6],[7]

Aug. 01, 2037

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

Mortgage Notes Payable

$ 67,268,004

92,704,649

Mortgage Notes [Member] | Model Home [Member]

Mortgage Notes Payable

^[3]

$ 22,154,128

$ 28,083,356

[1]	Waterman Plaza and Garden Gateway Plaza were sold during the first quarter of 2021, while Highland Court and Executive Office Park were sold in the second quarter of 2021.
[2]	During June 2021, this loan was paid in full with cash from the sale of other properties and excess cash on hand.
[3]	Properties held for sale as of December 31, 2021. Five model homes were included as held for sale.
[4]	The mortgage note payable for 300 N.P. is an amortizing loan with a balloon payment of $2.2 million due at maturity, on June 11, 2022, and is no longer subject to defeasance or yield maintenance. The Company expects to pay this note in full at or before maturity with proceeds from property sales, property financing and other available cash on hand.
[5]	Interest rates as of December 31, 2021.
[6]	Interest rate is subject to reset on September 1, 2023.
[7]	Property was listed as held for sale in February 2022.

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