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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

X

- Definition

Amount of consideration transferred for the purchase of real estate.

+ References

No definition available.

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X

- Definition

The percentage of interest in real estate property sold during the period.

+ References

No definition available.

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- Definition

The amount of real estate property sold.

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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

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-Section 45
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-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228

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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.

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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

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Name Accounting Standards Codification
-Topic 942
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-Section S99
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X

- Definition

The number of real estate properties owned as of the balance sheet date.

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The cash outflow from the acquisition of residential property intended to generate income for the owner.

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Cash received for the sale of real estate that is not part of an investing activity during the current period.

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