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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 |  |  |

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- 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 + Details
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