Summary of Significant Accounting Policies (Details)		3 Months Ended		6 Months Ended	12 Months Ended
	Oct. 01, 2018 extension	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Jun. 30, 2020	Dec. 31, 2019 USD ($)
Property, Plant and Equipment [Line Items]
Impairment of real estate		$ 0			$ 0
Goodwill impairment loss		0	$ 0
Net income (Loss)		$ 1,884,000	$ 360,000
Notes Payable to Banks | Hartman SPE, LLC
Property, Plant and Equipment [Line Items]
Number of extensions | extension	3
Extension term	1 year
Debt Instrument, Covenant, Debt Yield		12.95%			13.29%
Notes Payable to Banks | Hartman SPE, LLC | Scenario, Forecast
Property, Plant and Equipment [Line Items]
Debt instrument, covenant, debt yield, minimum				12.50%
Building and Building Improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life		5 years
Building and Building Improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life		39 years