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Note 3 - Recent Real Estate Transactions (Details Textual)								9 Months Ended
	Aug. 17, 2021 USD ($) ft²	May 21, 2021 USD ($)	May 20, 2021 USD ($)	Feb. 19, 2021 USD ($)	Jan. 28, 2021 USD ($)	Mar. 13, 2020 USD ($)	Feb. 05, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Notes Payable, Total										$ 7,500,086
NetREIT Palm Self Storage, LP and NetREIT Highland LLC [Member]
Noncontrolling Interest, Ownership Percentage by Parent	61.30%
Discontinued Operations, Disposed of by Sale [Member]
Proceeds from Sale of Real Estate, Total								19,000,000.0	$ 12,600,000
Gain (Loss) on Sale of Properties								$ 2,900,000	$ 900,000
Number of Real Estate Properties								39	33
Waterman Plaza [Member] | Discontinued Operations, Disposed of by Sale [Member]
Proceeds from Sale of Real Estate, Total					$ 3,500,000
Gain (Loss) on Sale of Properties					$ (200,000)
Garden Gateway [Member] | Discontinued Operations, Disposed of by Sale [Member]
Proceeds from Sale of Real Estate, Total				$ 11,200,000
Gain (Loss) on Sale of Properties				$ (1,400,000)
Highland Court [Member] | Discontinued Operations, Disposed of by Sale [Member]
Proceeds from Sale of Real Estate, Total			$ 10,200,000
Gain (Loss) on Sale of Properties			$ (1,600,000)
Executive Office Park [Member] | Discontinued Operations, Disposed of by Sale [Member]
Proceeds from Sale of Real Estate, Total		$ 8,100,000
Gain (Loss) on Sale of Properties		$ 2,500,000
Mandolin [Member]
Area of Real Estate Property (Square Foot) | ft²	10,500
Payments to Acquire Buildings	$ 4,900,000
Property Under Triple Net Lease, Percent Occupied	100.00%
Property under Triple Net Lease, Term (Year)	15 years
Model Home [Member]
Real Estate Property, Consideration Transferred, Total								$ 2,900,000	$ 9,000,000.0
Payments to Acquire Residential Real Estate								900,000	2,700,000
Notes Payable, Total									$ 6,300,000
Number of Real Estate Properties									25
Model Home [Member] | Mortgage Notes [Member]
Notes Payable, Total								$ 2,000,000.0
Centennial Tech Center [Member] | Discontinued Operations, Disposed of by Sale [Member]
Proceeds from Sale of Real Estate, Total							$ 15,000,000.0
Gain (Loss) on Sale of Properties							$ (900,000)
Union Terrace [Member] | Discontinued Operations, Disposed of by Sale [Member]
Proceeds from Sale of Real Estate, Total						$ 11,300,000
Gain (Loss) on Sale of Properties						$ 690,000

X

- Definition

Represents the occupancy percentage for a property under triple net lease.

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Represents the term of a triple net lease for a property.

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Amount of consideration transferred for the purchase of real estate.

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Area of a real estate property.

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- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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The number of real estate properties owned as of the balance sheet date.

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The cash outflow for acquisition of buildings (properties) whether for investment or use.

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The cash outflow from the acquisition of residential property intended to generate income for the owner.

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Cash received for the sale of real estate that is not part of an investing activity during the current period.

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