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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 |  |  |  |

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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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351718&loc=d3e2443-110228 + Details
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