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Related Party Transactions (Details) - USD ($)			1 Months Ended			3 Months Ended
Related Party Transactions (Details) - USD ($)	Mar. 01, 2019	Feb. 28, 2019	Mar. 31, 2019	Feb. 28, 2019	May 31, 2016	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Sep. 30, 2019	Feb. 26, 2019
Related Party Transaction [Line Items]
Property management fees and reimbursements due						$ 1,013,000	$ 950,000
Payments for leasing commissions						440,000	440,000
Due to the property manager						843,000		$ 1,168,000
Due from other related parties						$ (8,125,000)		(5,375,000)
Hartman SPE, LLC
Related Party Transaction [Line Items]
Share price (in dollars per share)	$ 12.65
Common Stock \| Hartman SPE, LLC
Related Party Transaction [Line Items]
Stock issued in exchange for ownership (in shares)	700,302
Value of shares issued	$ 8,858,826
Chief Executive Officer
Related Party Transaction [Line Items]
Ownership percentage						20.00%
Allen R Hartman \| Affiliated Entity
Related Party Transaction [Line Items]
Ownership percentage						70.00%
Property Manager \| Affiliated Entity
Related Party Transaction [Line Items]
Ownership percentage						30.00%
Texas Limited Liability Company \| Affiliated Entity \| Asset Management Fees Payable
Related Party Transaction [Line Items]
Expenses from transactions with related party						$ 2,069,000	1,953,000
Due to related parties						$ 1,966,000		2,077,000
Due to related parties, monthly fees, percentage of asset cost or value						0.0625%
Texas Limited Liability Company \| Affiliated Entity \| Construction Management Fees Payable
Related Party Transaction [Line Items]
Expenses from transactions with related party						$ 166,000	267,000
Hartman XIX \| Affiliated Entity \| Loan from Company to related party
Related Party Transaction [Line Items]
Loans receivable, face amount						$ 4,500,000
Loans receivable, interest rate						6.00%
Interest income, related parties						$ 63,000	63,000
Hartman XIX \| Affiliated Entity \| Loan From Company To Related Party Hartman Retail II Holdings Co
Related Party Transaction [Line Items]
Loans receivable						$ 4,200,000		4,200,000
HIREIT, Inc. \| Affiliated Entity \| Acquisition Of Related Party Common Stock
Related Party Transaction [Line Items]
Ownership percentage						11.00%
HIREIT, Inc. \| Affiliated Entity \| Acquisition Of Related Party Common Stock \| Common Stock
Related Party Transaction [Line Items]
Shares acquired (in shares)						1,561,523
Shares acquired, value						$ 8,978,000
Hartman TRS, Inc. \| Affiliated Entity \| Loan from Company to related party
Related Party Transaction [Line Items]
Loans receivable			$ 106,000			106,000	106,000
Hartman TRS, Inc. \| Affiliated Entity \| Loan From Company To Related Party Hartman Retail II Holdings Co
Related Party Transaction [Line Items]
Loans receivable					$ 7,231,000	1,726,000		2,476,000
Loans receivable, face amount					$ 8,820,000
Loans receivable, interest rate					10.00%
Interest income, related parties						43,000	61,000
Origination fees					2.00%
Hartman TRS, Inc. \| Affiliated Entity \| Loan From Company To Related Party Hartman Retail III Holdings Co
Related Party Transaction [Line Items]
Loans receivable						6,782,000		6,782,000		$ 6,782,455
Loans receivable, face amount		$ 7,500,000		$ 7,500,000
Loans receivable, interest rate				10.00%
Interest income, related parties						169,000
Origination fees		2.00%		2.00%
Hartman TRS, Inc. \| Affiliated Entity \| Loan from Company to related party
Related Party Transaction [Line Items]
Loans receivable			3,829,711			3,830,000	3,829,711	$ 3,830,000
Loans receivable, face amount			$ 3,500,000				$ 3,500,000
Loans receivable, interest rate			10.00%
Interest income, related parties						95,000
Origination fees									2.00%
Hartman vREIT XXI [Member] \| Affiliated Entity \| Loan From Related Party To Company
Related Party Transaction [Line Items]
Notes payable, related party						4,400,000
Interest expense, related party						$ 110,000
Debt instrument, stated interest rate						10.00%
Variable Interest Entity, Not Primary Beneficiary \| Hartman SPE, LLC
Related Party Transaction [Line Items]
Additional ownership	3.42%
Ownership interest	36.16%	32.74%