Real Estate Acquisitions (Details)		3 Months Ended							12 Months Ended
		Dec. 31, 2019 USD ($) properties	[1]	Sep. 30, 2019 USD ($) properties	Jun. 30, 2019 USD ($) properties	[2]	Mar. 31, 2019 USD ($) properties	[4]	Dec. 31, 2019 USD ($) properties	Dec. 31, 2018 USD ($) properties	[5]
Number of Properties | properties		177		18	81				277
Total purchase price	[3]	$ 46,377,093		$ 11,075,173	$ 27,304,055				$ 85,401,441
Predecessor [Member]
Number of Properties | properties							1			10
Total purchase price	[3]						$ 645,120			$ 2,785,580
Land [Member]
Total purchase price		8,320,008		2,619,719	6,789,589				17,908,518
Land [Member] | Predecessor [Member]
Total purchase price							179,202			1,615,182
Building and Improvements [Member]
Total purchase price		35,658,446		8,306,781	18,774,918				63,196,695
Building and Improvements [Member] | Predecessor [Member]
Total purchase price							456,550			1,201,090
Tenant Improvements [Member]
Total purchase price		447,929		190,343	259,640				916,078
Tenant Improvements [Member] | Predecessor [Member]
Total purchase price							18,166			69,497
In-place lease intangibles [Member]
Total purchase price		3,383,050		982,974	2,227,870				6,663,398
In-place lease intangibles [Member] | Predecessor [Member]
Total purchase price							69,504			340,366
Above-market leases [Member]
Total purchase price		14,680			6,338				21,018
Above-market leases [Member] | Predecessor [Member]
Total purchase price										19,603
Below Market Leases [Member]
Total purchase price		$ (1,447,020)		$ (1,024,644)	$ (754,300)				$ (3,304,266)
Below Market Leases [Member] | Predecessor [Member]
Total purchase price							$ (78,302)			$ (460,158)

[1] Includes the acquisition of a 113-building portfolio leased to the USPS. The contract purchase price for the portfolio was $31.4 million, excluding closing costs, and included 824,350 OP Units to be issued to the sellers at a value of $17.00 per unit. The closing price of the Company's common stock on November 22, 2019 was $16.05; therefore, total consideration at closing, excluding closing costs was approximately $30.6 million of which $13.2 million represented the non-cash consideration (the value of the OP Units) issued to the sellers.

[2] The Company acquired the Acquisition Properties in connection with the IPO.

[3] Includes acquisition costs of $10,120 for the three months ended March 31, 2019, $0.4 million for the three months ended June 30, 2019, $0.1 million for the three months ended September 30, 2019 and $0.8 million for the three months ended December 31, 2019. For the year ended December 31, 2018, includes acquisition costs of $0.02 million.

[4] The property was acquired by the Predecessor.

[5] The properties were acquired by the Predecessor during the year ended December 31, 2018.