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Note 3 - Recent Real Estate Transactions (Details Textual) |  |  |  |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 13, 2020 USD ($) | Feb. 05, 2020 USD ($) | May 08, 2019 USD ($) | Jan. 15, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Number of Real Estate Properties |  |  |  |  | 132 |  |  |
Notes Payable, Total |  |  |  |  | $ 8,250,821 |  | $ 12,238,692 |
Discontinued Operations, Disposed of by Sale [Member] |  |  |  |  |  |  |  |
Proceeds from Sale of Real Estate, Total |  |  |  |  |  |  | 25,100,000 |
Gain (Loss) on Sale of Properties |  |  |  |  |  |  | $ 6,300,000 |
Centennial Tech Center [Member] | Discontinued Operations, Disposed of by Sale [Member] |  |  |  |  |  |  |  |
Proceeds from Sale of Real Estate, Total |  | $ 15,000,000 |  |  |  |  |  |
Gain (Loss) on Sale of Properties |  | $ (913,000) |  |  |  |  |  |
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 | $ 688,000 |  |  |  |  |  |  |
Model Home [Member] |  |  |  |  |  |  |  |
Number of Real Estate Properties |  |  |  |  | 17 | 18 | 33 |
Real Estate Property, Consideration Transferred, Total |  |  |  |  | $ 6,300,000 | $ 6,100,000 | $ 13,000,000 |
Payments to Acquire Residential Real Estate |  |  |  |  | 1,900,000 | 1,800,000 |  |
Model Home [Member] | Mortgage Notes [Member] |  |  |  |  |  |  |  |
Notes Payable, Total |  |  |  |  | 4,400,000 | 4,300,000 |  |
Model Home [Member] | Discontinued Operations, Disposed of by Sale [Member] |  |  |  |  |  |  |  |
Proceeds from Sale of Real Estate, Total |  |  |  |  | 8,000,000 | 9,400,000 | 14,600,000 | 12,600,000
Gain (Loss) on Sale of Properties |  |  |  |  | $ 557,000 | $ 783,000 | $ 1,200,000 | $ 988,000
Number of Real Estate Properties |  |  |  |  | 21 | 26 | 41 | 33
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 |  |  |  |
Number of Real Estate Properties |  |  |  | 15 |  |  |  |
Nightingale Land [Member] | Discontinued Operations, Disposed of by Sale [Member] |  |  |  |  |  |  |  |
Proceeds from Sale of Real Estate, Total |  |  | $ 875,000 |  |  |  |  |
Gain (Loss) on Sale of Properties |  |  | $ (93,000) |  |  |  |  |

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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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