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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.

X

- 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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X

- 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

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- Definition

Weighted average interest rate of debt outstanding.

+ References

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X

- 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

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