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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.

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Amount of interest expense incurred on a debt or other obligation to related party.

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Amount of interest income earned from interest-bearing assets owed to the entity by related party.

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For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date.

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Net asset value per share or per unit of investments in certain entities that calculate net asset value per share. Includes, but is not limited to, by unit, membership interest, or other ownership interest. Investment includes, but is not limited to, investment in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds. Excludes fair value disclosure.

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The amount for notes payable (written promise to pay), due to related parties.

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Net cash outflow for the allowance granted to lessee and/or direct costs incurred by lessor used to prepare the leased premises for tenant's occupancy; for costs that are essential to originating the lease and would not otherwise have been incurred without the lease agreement, including but not limited to, evaluating the lessee's credit condition, guarantees, and collateral and costs incurred in negotiating, processing, and executing the lease agreement; and for any commission(s) incurred.

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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Related Party Transactions (Details) - USD ($)			1 Months Ended			3 Months Ended		6 Months Ended
Related Party Transactions (Details) - USD ($)	Mar. 01, 2019	Feb. 28, 2019	Mar. 31, 2019	Feb. 28, 2019	May 31, 2016	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Related Party Transaction [Line Items]
Property management fees and reimbursements due						$ 521,000	$ 1,255,000	$ 1,534,000	$ 2,205,000
Payments for leasing commissions						440,000	440,000	880,000	880,000
Long-term debt, gross						309,871,000		309,871,000		$ 306,793,000
Hartman SPE, LLC
Related Party Transaction [Line Items]
Long-term debt, gross						259,000,000		$ 259,000,000		259,000,000
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%
Due to the 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						2,049,000	2,007,000	$ 4,118,000	3,972,000
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						143,000	94,000	$ 309,000	361,000
Hartman XIX \| Affiliated Entity \| Loan from Company to related party
Related Party Transaction [Line Items]
Loans receivable, face amount						4,500,000		$ 4,500,000
Loans receivable, interest rate								6.00%
Interest income, related parties						63,000	63,000	$ 126,000	126,000
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		$ 4,200,000
Due from HIREIT \| Affiliated Entity \| Acquisition Of Related Party Common Stock
Related Party Transaction [Line Items]
Ownership percentage								11.00%
Due from HIREIT \| Affiliated Entity \| Acquisition Of Related Party Common Stock \| Common Stock
Related Party Transaction [Line Items]
Shares acquired (in shares)						1,561,523		1,561,523
Shares acquired, value						$ 8,978,000		$ 8,978,000
Net asset value per share (in usd per share)										$ 8.18
Hartman TRS, Inc. \| Affiliated Entity \| Loan from Company to related party
Related Party Transaction [Line Items]
Dividend distribution from related party						106,000	213,000	106,000	213,000
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		1,726,000		$ 2,476,000
Loans receivable, face amount					$ 8,820,000
Origination fees					2.00%
Loans receivable, interest rate					10.00%
Interest income, related parties						43,000	58,000	86,000	119,000
Hartman TRS, Inc. \| Affiliated Entity \| Loan From Company To Related Party Hartman Retail III Holdings Co
Related Party Transaction [Line Items]
Loans receivable		$ 6,782,455		$ 6,782,455		6,782,000		6,782,000		6,782,000
Loans receivable, face amount		$ 7,500,000		$ 7,500,000
Origination fees		2.00%		2.00%
Loans receivable, interest rate				10.00%
Interest income, related parties						169,000	0	338,000	0
Hartman TRS, Inc. \| Affiliated Entity \| Loan from Company to related party
Related Party Transaction [Line Items]
Loans receivable			$ 3,829,711			3,830,000		3,830,000		$ 3,830,000
Loans receivable, face amount			$ 3,500,000
Origination fees			2.00%
Loans receivable, interest rate			10.00%
Interest income, related parties						95,000	$ 0	191,000	$ 0
Due to vREIT XXI \| Affiliated Entity \| Loan From Related Party To Company
Related Party Transaction [Line Items]
Notes payable, related party						$ 10,000,000		$ 10,000,000
Debt instrument, stated interest rate						10.00%		10.00%
Interest expense, related party						$ 204,000		$ 314,000
Variable Interest Entity, Not Primary Beneficiary \| Hartman SPE, LLC
Related Party Transaction [Line Items]
Additional ownership	3.42%
Ownership interest	36.16%	32.74%