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Note 4 - Real Estate Assets (Details Textual)	12 Months Ended
	Dec. 31, 2020 ft²	Dec. 31, 2016	Dec. 02, 2020	Dec. 31, 2019
Number of States Real Estate Property is Located	7
Number of Limited Partnerships in which Company is Sole General Partner		1
Number of Limited Liability Companies		4
Discontinued Operations, Disposed of by Sale [Member]
Number of Real Estate Properties	46		4	41
Model Home [Member]
Number of Real Estate Properties	28			33
Number of Real Estate Properties Held for Sale	7
Executive Office Park [Member]
Number of Real Estate Properties	4
Executive Office Park [Member] | Discontinued Operations, Disposed of by Sale [Member]
Number of Real Estate Properties	1		1
Office/Industrial Properties [Member]
Area of Real Estate Property (Square Foot)	982,796
Office/Industrial Properties [Member] | Industrial Buildings [Member]
Number of Real Estate Properties	1
Office/Industrial Properties [Member] | Office Buildings [Member]
Number of Real Estate Properties	10
Retail Properties [Member]
Number of Real Estate Properties	4
Area of Real Estate Property (Square Foot)	131,722
Model Home [Member]
Number of Real Estate Properties	118
Number of Limited Partnerships in which Company is Sole General Partner	6
Number of Limited Liability Companies	1
Lessee, Operating Lease, Term of Contract (Month)	18 months
NORTH DAKOTA
Number of Real Estate Properties	4

X

- Definition

Represents the number of limited liability companies.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Represents the number of limited partnerships in which the Company is the sole general partner.

+ References

No definition available.

+ Details

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X

- Definition

Represents the number of real estate properties held for sale.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

The number of states in which real estate property is located.

+ References

No definition available.

+ Details

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X

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

X

- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980

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X

- Definition

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

+ References

No definition available.

+ Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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- Details

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- Details

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