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Note 3 - Recent Real Estate Transactions (Details Textual) |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 02, 2020 USD ($) | Mar. 13, 2020 USD ($) | Feb. 05, 2020 USD ($) | Jul. 31, 2019 USD ($) | Jul. 01, 2019 USD ($) | May 08, 2019 USD ($) | Jan. 15, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Notes Payable, Total |  |  |  |  |  |  |  | $ 7,500,086 | $ 12,238,692
Discontinued Operations, Disposed of by Sale [Member] |  |  |  |  |  |  |  |  |
Proceeds from Sale of Real Estate, Total |  |  |  |  |  |  |  | 18,100,000 | 14,600,000
Gain (Loss) on Sale of Properties |  |  |  |  |  |  |  | $ 1,600,000 | $ 1,200,000
Number of Real Estate Properties | 4 |  |  |  |  |  |  | 46 | 41
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 |  | $ 700,000 |  |  |  |  |  |  |
Executive Office Park [Member] |  |  |  |  |  |  |  |  |
Number of Real Estate Properties |  |  |  |  |  |  |  | 4 |
Executive Office Park [Member] | Discontinued Operations, Disposed of by Sale [Member] |  |  |  |  |  |  |  |  |
Proceeds from Sale of Real Estate, Total | $ 2,300,000 |  |  |  |  |  |  |  |
Gain (Loss) on Sale of Properties | $ (78,000) |  |  |  |  |  |  |  |
Number of Real Estate Properties | 1 |  |  |  |  |  |  | 1 |
Morena Office Center [Member] | Discontinued Operations, Disposed of by Sale [Member] |  |  |  |  |  |  |  |  |
Proceeds from Sale of Real Estate, Total |  |  |  |  |  |  | $ 5,600,000 |  |
Gain (Loss) on Sale of Properties |  |  |  |  |  |  | $ 700,000 |  |
Nightingale Land [Member] | Discontinued Operations, Disposed of by Sale [Member] |  |  |  |  |  |  |  |  |
Proceeds from Sale of Real Estate, Total |  |  |  |  |  | $ 900,000 |  |  |
Gain (Loss) on Sale of Properties |  |  |  |  |  | $ (93,000) |  |  |
Genesis Plaza [Member] | Discontinued Operations, Disposed of by Sale [Member] |  |  |  |  |  |  |  |  |
Proceeds from Sale of Real Estate, Total |  |  |  |  | $ 2,900,000 |  |  |  |
Sale of Percentage Interest in Real Estate Property |  |  |  |  | 43.00% |  |  |  |
Sale of Real Estate Property |  |  |  |  | $ 5,600,000 |  |  |  |
The Presidio [Member] | Discontinued Operations, Disposed of by Sale [Member] |  |  |  |  |  |  |  |  |
Proceeds from Sale of Real Estate, Total |  |  |  | $ 12,300,000 |  |  |  |  |
Gain (Loss) on Sale of Properties |  |  |  | $ 4,500,000 |  |  |  |  |
Model Home [Member] |  |  |  |  |  |  |  |  |
Number of Real Estate Properties |  |  |  |  |  |  |  | 28 | 33
Real Estate Property, Consideration Transferred, Total |  |  |  |  |  |  |  | $ 10,200,000 | $ 13,000,000.0
Payments to Acquire Residential Real Estate |  |  |  |  |  |  |  | 3,100,000 | 3,900,000
Model Home [Member] | Mortgage Notes [Member] |  |  |  |  |  |  |  |  |
Notes Payable, Total |  |  |  |  |  |  |  | $ 7,100,000 | $ 9,100,000

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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=121586364&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=109226348&loc=d3e2443-110228 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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