The Company's IPO and Formation Transactions (Details) - USD ($)		5 Months Ended	7 Months Ended	12 Months Ended
		May 16, 2019	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Revenues
Rental income				$ 8,865,868
Tenant reimbursements				1,311,121
Fee and other income				1,112,367
Total revenues				11,289,356
Operating Expenses
Real estate taxes				1,366,892
Property operating expenses				1,207,486
General and administrative				4,846,392
Depreciation and amortization				3,800,059
Total operating expenses				11,220,829
Income (loss) from operations				68,527
Interest expense, net:
Contractual interest expense				(1,098,788)
Amortization of deferred financing fees				(242,763)
Loss on early extinguishment of Predecessor debt				(185,586)
Interest income				5,928
Total interest expense, net				(1,521,209)
Income (loss) before income tax expense				(1,452,682)
Income tax (expense) benefit				(39,749)
Net income (loss)			$ (1,960,181)	(1,492,431)
Net loss attributable to common stockholders	[1]			$ (1,497,213)
Predecessor [Member]
Revenues
Rental income		$ 2,249,355			$ 5,662,145
Tenant reimbursements		348,075			892,541
Fee and other income		427,959			1,130,449
Total revenues		3,025,389			7,685,135
Operating Expenses
Real estate taxes		358,693			919,783
Property operating expenses		357,779			948,775
General and administrative		501,204			1,410,344
Depreciation and amortization		725,756			1,832,237
Total operating expenses		1,943,432			5,111,139
Income (loss) from operations		1,081,957			2,573,996
Interest expense, net:
Contractual interest expense		(570,819)			(1,478,545)
Amortization of deferred financing fees		(4,773)			(12,556)
Loss on early extinguishment of Predecessor debt
Interest income		1,134			4,504
Total interest expense, net		(574,458)			(1,486,597)
Income (loss) before income tax expense		507,499			1,087,399
Income tax (expense) benefit		(39,749)			60,763
Net income (loss)		467,750			$ 1,148,162
Net income attributable to noncontrolling interest in properties		(4,336)
Net income attributable to Predecessor		$ 463,414
Postal Realty Trust, Inc.
Revenues
Rental income			6,616,513
Tenant reimbursements			963,046
Fee and other income			684,408
Total revenues			8,263,967
Operating Expenses
Real estate taxes			1,008,199
Property operating expenses			849,707
General and administrative			4,345,188
Depreciation and amortization			3,074,303
Total operating expenses			9,277,397
Income (loss) from operations			(1,013,430)
Interest expense, net:
Contractual interest expense			(527,969)
Amortization of deferred financing fees			(237,990)
Loss on early extinguishment of Predecessor debt			(185,586)
Interest income			4,794
Total interest expense, net			(946,751)
Income (loss) before income tax expense			(1,960,181)
Income tax (expense) benefit
Net income (loss)			(1,960,181)
Net income attributable to noncontrolling interest in properties
Net income attributable to Predecessor
Net loss attributable to Operating Partnership unitholders' noncontrolling interest			462,968
Net loss attributable to common stockholders			$ (1,497,213)

[1] The combined statements of operations prior to May 16, 2019 represents the activity of the Predecessor and EPS was not applicable.