The Company's IPO and Formation Transactions (Details) - USD ($)		1 Months Ended	2 Months Ended	3 Months Ended				5 Months Ended	6 Months Ended
		Jun. 30, 2019	May 16, 2019	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	May 16, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues
Rental income				$ 4,640,403		$ 1,856,428			$ 8,941,174	$ 3,348,814
Tenant reimbursements				652,748		273,229			1,254,094	510,085
Fee and other income				311,786		276,325			607,305	563,251
Total revenues				5,604,937		2,405,982			10,802,573	4,422,150
Operating Expenses:
Real estate taxes				696,865		288,771			1,338,809	538,560
Property operating expenses				394,434		248,586			801,482	500,292
General and administrative				1,916,905		968,032			4,218,448	1,344,923
Depreciation and amortization				2,161,782		767,772			4,196,650	1,248,215
Total operating expenses				5,169,986		2,273,161			10,555,389	3,631,990
Income (loss) from operations				434,951		132,821			247,184	790,160
Interest expense, net:
Contractual interest expense				(544,915)		(228,040)			(1,273,141)	(586,507)
Amortization of deferred financing costs				(115,399)		(1,854)			(219,861)	(5,035)
Loss on early extinguishment of Predecessor debt						(185,586)				(185,586)
Interest income				661		1,124			1,487	2,258
Total interest expense, net				(659,653)		(414,356)			(1,491,515)	(774,870)
Income (loss) before income tax expense				(224,702)		(281,535)			(1,244,331)	15,290
Income tax expense				(4,925)		(6,259)			(15,122)	(46,008)
Net income (loss)				(229,627)	$ (1,029,826)	(287,794)			(1,259,453)	(30,718)
Less:
Net loss attributable to common stockholders	[1]			$ (150,550)					$ (828,305)
Postal Realty Trust, Inc.
Revenues
Rental income		$ 1,099,459
Tenant reimbursements		162,010
Fee and other income		135,292
Total revenues		1,396,761
Operating Expenses:
Real estate taxes		171,048
Property operating expenses		133,576
General and administrative		861,475
Depreciation and amortization		522,459
Total operating expenses		1,688,558
Income (loss) from operations		(291,797)
Interest expense, net:
Contractual interest expense		(15,688)
Amortization of deferred financing costs		(262)
Loss on early extinguishment of Predecessor debt		(185,586)
Interest income		1,124
Total interest expense, net		(200,412)
Income (loss) before income tax expense		(492,209)
Income tax expense		(6,259)
Net income (loss)		(498,468)
Less:
Net income attributable to noncontrolling interest in properties
Net income attributable to Predecessor
Net loss attributable to Operating Partnership unitholders' noncontrolling interests		106,672
Net loss attributable to common stockholders		(391,796)
Predecessor [Member]
Revenues
Rental income			$ 756,969					$ 2,249,355
Tenant reimbursements			111,219					348,075
Fee and other income			141,033					427,959
Total revenues			1,009,221					3,025,389
Operating Expenses:
Real estate taxes			117,723					367,512
Property operating expenses			115,010					366,716
General and administrative			106,557					483,448
Depreciation and amortization			245,313					725,756
Total operating expenses			584,603					1,943,432
Income (loss) from operations			424,618					1,081,957
Interest expense, net:
Contractual interest expense			(212,352)					(570,819)
Amortization of deferred financing costs			(1,592)					(4,773)
Loss on early extinguishment of Predecessor debt
Interest income								1,134
Total interest expense, net			(213,944)					(574,458)
Income (loss) before income tax expense			210,674					507,499
Income tax expense								(39,749)
Net income (loss)		$ (498,468)	210,674				$ 257,076	467,750
Less:
Net income attributable to noncontrolling interest in properties			(1,493)					(4,336)
Net income attributable to Predecessor			$ 209,181					$ 463,414
Net loss attributable to common stockholders	[1]					$ (391,796)				$ (391,796)

[1] The combined statements of operations prior to May 17, 2019 represents the activity of the Predecessor and EPS was not applicable.