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Note 7 - Mortgage Notes Payable (Details Textual) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019
Number of Real Estate Properties Held for Sale |  | 4 |
Number of Real Estate Properties |  | 128 |
Executive Office Park [Member] |  |  |
Number of Real Estate Properties Held for Sale |  | 1 |
Number of Real Estate Properties |  | 4 |
Executive Office Park [Member] | Mortgage Notes [Member] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | [1],[2] | 4.83% |
Model Home [Member] |  |  |
Number of Real Estate Properties Held for Sale |  | 1 |
Number of Real Estate Properties |  | 25 | 18
World Plaza [Member] | Mortgage Notes [Member] |  |  |
Debt, Weighted Average Interest Rate |  | 3.53% |
World Plaza [Member] | ABR [Member] | Mortgage Notes [Member] |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.75% |
World Plaza [Member] | London Interbank Offered Rate (LIBOR) [Member] | Mortgage Notes [Member] |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.75% |
Model Home Properties [Member] | Mortgage Notes [Member] | Minimum [Member] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 2.50% |
Model Home Properties [Member] | Mortgage Notes [Member] | Maximum [Member] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.63% |
Waterman Plaza [Member] | Mortgage Notes [Member] |  |  |
Debt Instrument, Floor Interest Rate |  | 4.25% |
Waterman Plaza [Member] | London Interbank Offered Rate (LIBOR) [Member] | Mortgage Notes [Member] |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 3.00% |
[1] | Interest rates as of September 30, 2020.
[2] | Properties held for sale as of September 30, 2020. One of four buildings at Executive Office Park was classified as held for sale; one model home was included as held for sale.

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- Definition The floor interest rate under the debt agreement. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the number of real estate properties held for sale. + References No definition available. + Details
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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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- Details
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- Details
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