Organization and Description of Business (Details Narrative)	6 Months Ended
	Jun. 30, 2020 properties States $ / shares shares	Dec. 31, 2019 $ / shares shares	May 19, 2019 $ / shares	May 16, 2019 properties	May 15, 2019 $ / shares shares
Business Description and Basis of Presentation [Line Item]
Common stock, shares authorized					600,000,000
Common stock, par value | $ / shares					$ 0.01
Percentage of interest in operating partnership	65.70%
Number of properties | properties	6
IPO [Member]
Business Description and Basis of Presentation [Line Item]
Common stock, shares authorized					500,000,000
Common stock, par value | $ / shares					$ 0.01
Preferred stock, shares authorized					100,000,000
Class A [Member]
Business Description and Basis of Presentation [Line Item]
Common stock, shares authorized	500,000,000	500,000,000
Common stock, par value | $ / shares	$ 0.01	$ 0.01	$ 0.01
Common stock, shares issued	5,423,861	5,285,904
Class B [Member]
Business Description and Basis of Presentation [Line Item]
Common stock, shares authorized	27,206	27,206
Common stock, par value | $ / shares	$ 0.01	$ 0.01
Common stock, shares issued	27,206	27,206
Postal Realty Management [Member]
Business Description and Basis of Presentation [Line Item]
Number of properties managed | properties	400
LLCs, UPH and the limited partnership [Member] | Predecessor [Member]
Business Description and Basis of Presentation [Line Item]
Number of properties | properties				190
Number of States | properties				33
USPS [Member]
Business Description and Basis of Presentation [Line Item]
Number of properties | properties	568
Number of States | States	47
Postal Realty Trust, Inc. [Member]
Business Description and Basis of Presentation [Line Item]
Organization date	Nov. 19, 2018
NPM [Member]
Business Description and Basis of Presentation [Line Item]
Formation date	Nov. 17, 2004