Redeemable Non-Controlling Interests - Additional Information (Details)							9 Months Ended
	Aug. 02, 2021 USD ($)	Apr. 21, 2021 USD ($)	Feb. 11, 2021 USD ($)	Nov. 30, 2020 USD ($) Building Entity Investor $ / shares shares	Sep. 30, 2019 USD ($) Building Entity Investor $ / shares shares	Sep. 11, 2019 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Aug. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Redeemable Noncontrolling Interest [Line Items]
Acquisition of building							$ 4,006,727
Redeemable noncontrolling interest redeemed							9,605,028	$ 8,198,251		$ 10,134,431	$ 9,184,431	$ 8,684,431	$ 8,198,251	$ 8,198,251	$ 8,198,251
Preferred Equity Partners
Redeemable Noncontrolling Interest [Line Items]
Payments of distributions							34,000
Accrued value of deferred internal rate of return							17,000
Brown Family Trust
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interest redeemed							500,000	1,200,000	$ 1,200,000	1,700,000	$ 1,700,000	$ 1,200,000	$ 1,200,000	$ 1,200,000	$ 1,200,000
Payments of distributions							110,000	90,000
Irby Property Partners
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interest redeemed							967,178			$ 950,000
Hornstrom
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interest redeemed							653,419
Rockville, IL
Redeemable Noncontrolling Interest [Line Items]
Payments of distributions							7,000
Accrued value of deferred internal rate of return							3,000
Redeemable Interests
Redeemable Noncontrolling Interest [Line Items]
Payments of distributions							$ 238,000	$ 245,000
Preferred Equity Agreement | Brown Family Trust
Redeemable Noncontrolling Interest [Line Items]
Capital contribution received			$ 500,000			$ 1,200,000
Noncontrolling interest, description							Pursuant to the agreement, the Company was required to pay the preferred equity member a 10% IRR on a monthly basis and redeem the entire amount due after 24 months at the option of the preferred equity member.
Noncontrolling interest internal rate of return percentage paid on monthly basis			9.00%			10.00%
Current redemption amount			$ 500,000
Noncontrolling interest income allocated percentage			100.00%
Noncontrolling interest, description							Pursuant to the agreement, the Company will pay the preferred equity member a 9% IRR on a monthly basis and redeem the entire amount due after 24 months at the option of the preferred equity member.
Preferred Equity Agreement | Irby Property Partners | Preferred Equity Partners
Redeemable Noncontrolling Interest [Line Items]
Capital contribution received		$ 950,000
Noncontrolling interest, description							Pursuant to the agreement, the Company will pay the preferred equity member a 12% total IRR with an 8% IRR paid on a monthly basis and the deferred IRR will be paid at the end of 24 months along with the entire $950,000 amount due after 24 months at the option of the preferred equity member.
Noncontrolling interest internal rate of return percentage paid on monthly basis		8.00%
Current redemption amount		$ 967,178
Noncontrolling interest income allocated percentage		100.00%
Noncontrolling interest total internal rate of return percentage		12.00%
Noncontrolling interest, amount due		$ 950,000
Preferred Equity Agreement | Hornstrom | Preferred Equity Partners
Redeemable Noncontrolling Interest [Line Items]
Capital contribution received	$ 650,000
Noncontrolling interest internal rate of return percentage paid on monthly basis	8.00%
Current redemption amount	$ 653,419
Noncontrolling interest income allocated percentage	100.00%
Noncontrolling interest total internal rate of return percentage	12.00%
Noncontrolling interest, amount due	$ 650,000
Contribution Agreement | Operating Partnership
Redeemable Noncontrolling Interest [Line Items]
Number of entities | Entity					2
Number of common units issued | shares					349,913
Common units issue price per share | $ / shares					$ 20.00
Common units value issued					$ 6,998,251
Percentage value of interest in common units							13.80%
Number of investors required to redeem | Investor					2
Common units redemption price per share | $ / shares					$ 20.00
Contribution Agreement | One Entity
Redeemable Noncontrolling Interest [Line Items]
Number of entities | Entity				1
Number of common units issued | shares				24,309
Common units issue price per share | $ / shares				$ 20.00
Common units value issued				$ 486,180
Percentage value of interest in common units							1.00%
Number of investors required to redeem | Investor				2
Common units redemption price per share | $ / shares				$ 20.00
Cocoa, FL | Preferred Equity Agreement | Brown Family Trust
Redeemable Noncontrolling Interest [Line Items]
Acquisition of building						$ 4,500,000
Manteo, NC
Redeemable Noncontrolling Interest [Line Items]
Acquisition of building							$ 2,249,394
Capital contribution received							500,000
Manteo, NC | Preferred Equity Agreement | Brown Family Trust
Redeemable Noncontrolling Interest [Line Items]
Acquisition of building			$ 1,700,000
Plant City, FL
Redeemable Noncontrolling Interest [Line Items]
Acquisition of building							1,757,333
Capital contribution received							$ 950,000
Plant City, FL | Preferred Equity Agreement | Irby Property Partners | Preferred Equity Partners
Redeemable Noncontrolling Interest [Line Items]
Acquisition of building		$ 1,700,000
Rockville, IL | Preferred Equity Agreement | Hornstrom | Preferred Equity Partners
Redeemable Noncontrolling Interest [Line Items]
Acquisition of building	$ 700,000
Norfolk, VA | Contribution Agreement | Operating Partnership
Redeemable Noncontrolling Interest [Line Items]
Acquisition of building					$ 18,600,000
Number of buildings acquired | Building					2
Tampa, FL | Contribution Agreement | One Entity
Redeemable Noncontrolling Interest [Line Items]
Acquisition of building				$ 1,800,000
Number of buildings acquired | Building				1