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Related Party Transactions (Details) - USD ($)				12 Months Ended
Related Party Transactions (Details) - USD ($)	Mar. 01, 2019	Feb. 28, 2019	May 17, 2016	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2019	Feb. 26, 2019	Feb. 28, 2009
Related Party Transaction [Line Items]
Balance due (from) to the Property Manager				$ 1,168,000	$ 462,000
Due from other related parties				5,375,000	170,000
Due to related parties				$ 0	1,496,000
Share price (in dollars per share)								$ 10.00
Ownership percentage	36.16%	32.74%
Hartman SPE LLC
Related Party Transaction [Line Items]
Share price (in dollars per share)	$ 12.65
Variable Interest Entity, Primary Beneficiary \| Hartman SPE LLC
Related Party Transaction [Line Items]
Additional ownership percentage acquired	3.42%
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]
Property management fees and reimbursements				$ 8,053,000	4,910,000
Payments for leasing commissions				4,948,000	4,103,000
Asset management fees				1,760,000	1,760,000
Due to related parties				$ 2,077,000	1,204,000
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]
Asset management fees				$ 664,000	2,122,000
Hartman Short Term Income Properties XIX, Inc. \| 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 party				$ 252,000	252,000
Hartman Short Term Income Properties XIX, Inc. \| Affiliated Entity \| Loan From Company To Related Party Hartman Retail II Holdings Co
Related Party Transaction [Line Items]
Loans receivable, related parties				$ 4,200,000
HIREIT, Inc. \| Affiliated Entity \| Acquisition Of Related Party Stock
Related Party Transaction [Line Items]
Ownership percentage				11.00%
HIREIT, Inc. \| Affiliated Entity \| Dividend Distributions
Related Party Transaction [Line Items]
Amounts of transaction with related party				$ 425,000	425,000
Hartman TRS, Inc. \| Affiliated Entity \| Loan From Company To Related Party
Related Party Transaction [Line Items]
Loans receivable, interest rate			10.00%
Origination fees, percentage			2.00%
Hartman TRS, Inc. \| Affiliated Entity \| Loan From Company To Related Party Hartman Retail II Holdings Co
Related Party Transaction [Line Items]
Loans receivable, face amount			$ 8,820,000
Loans receivable, related parties			$ 7,231,000	2,476,000	2,476,000
Interest income, related party				235,000	$ 456,000
Hartman TRS, Inc. \| Affiliated Entity \| Loan From Company To Related Party Hartman Ashford Bayou, LLC
Related Party Transaction [Line Items]
Loans receivable, face amount						$ 3,500,000
Loans receivable, interest rate			10.00%
Loans receivable, related parties				3,829,711		$ 3,829,711
Interest income, related party				298,000
Origination fees, percentage			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, face amount							$ 7,500,000
Loans receivable, related parties				6,782,455			$ 6,782,455
Interest income, related party				570,000
Hartman vREIT XXI \| Affiliated Entity \| Loan From Related Party To Company
Related Party Transaction [Line Items]
Note payable to related party				$ 4,400,000
Debt instrument, stated interest rate				5.00%
Interest Expense, Related Party				$ 23,000
Common Stock \| Hartman SPE LLC
Related Party Transaction [Line Items]
Shares issued in exchange for ownership (in shares)	700,302
Value of shares issued	$ 8,859,000
Common Stock \| HIREIT, Inc. \| Affiliated Entity \| Acquisition Of Related Party Stock
Related Party Transaction [Line Items]
Shares acquired (in shares)				1,561,523
Value of shares acquired				$ 8,978,000