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Note 7 - Mortgage Notes Payable 1 (Details Textual) - USD ($) $ in Millions |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 05, 2020 | Jun. 30, 2020 | Dec. 31, 2019
World Plaza [Member] |  |  |  |
Debt, Weighted Average Interest Rate |  |  | 4.40% |
World Plaza [Member] | ABR [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 0.75% |
World Plaza [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 2.75% |
World Plaza [Member] | Mortgage Notes [Member] |  |  |  |
Debt, Weighted Average Interest Rate |  |  |  | 5.04%
World Plaza [Member] | Mortgage Notes [Member] | ABR [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 0.75%
World Plaza [Member] | Mortgage Notes [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 2.75%
Model Home Properties [Member] | Subsequent Event [Member] |  |  |  |
Proceeds from Sale of Real Estate, Total |  | $ 15 |  |
Model Home Properties [Member] | Minimum [Member] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 2.52% |
Model Home Properties [Member] | Maximum [Member] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.63% |
Model Home Properties [Member] | Mortgage Notes [Member] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | [1],[2] |  |  |
Model Home Properties [Member] | Mortgage Notes [Member] | Minimum [Member] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 3.80%
Model Home Properties [Member] | Mortgage Notes [Member] | Maximum [Member] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 5.60%
[1] | Each Model Home has a stand-alone mortgage note at interest rates ranging from 3.8% to 5.6% (at December 31, 2019).
[2] | Interest rates as of December 31, 2019.

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Cash received for the sale of real estate that is not part of an investing activity during the current period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
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