Organization and Description of Business (Details Narrative)	12 Months Ended
	Dec. 31, 2019 properties States Segments $ / shares shares	May 16, 2019 properties States $ / shares	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	70.00%
Number of properties | properties	466
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
Real estate investment trust, description	The Company elected to qualify as a real estate investment trust ("REIT") under the Code beginning with its short taxable year ending December 31, 2019. As a REIT, the Company generally will not be subject to federal income tax to the extent that it distributes at least 90% of its REIT taxable income, determined without regard to the deduction for the dividends paid and excluding net capital gains for each tax year to its stockholders. REITs are subject to a number of organizational and operational requirements.
Class A [Member]
Business Description and Basis of Presentation [Line Item]
Common stock, shares authorized	500,000,000
Common stock, par value | $ / shares	$ 0.01
Common stock, shares issued	5,285,904
Class A [Member] | Predecessor [Member]
Business Description and Basis of Presentation [Line Item]
Common stock, par value | $ / shares		$ 0.01
Class B [Member]
Business Description and Basis of Presentation [Line Item]
Common stock, shares authorized	27,206
Common stock, par value | $ / shares	$ 0.01
Common stock, shares issued	27,206
PRM [Member]
Business Description and Basis of Presentation [Line Item]
Number of properties managed | properties	403
LLCs, UPH and the limited partnership [Member]
Business Description and Basis of Presentation [Line Item]
Number of properties | properties		190
Number of States | States		33
USPS [Member]
Business Description and Basis of Presentation [Line Item]
Number of properties | properties	466
Number of States | States	44
Number of reportable segment | Segments	1
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