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Note 4 - Real Estate Assets 1 (Details Textual) | Feb. 05, 2020 USD ($) | Jun. 30, 2020 ft² | Dec. 31, 2019 ft²
--- | --- | --- | ---
Number of States Real Estate Property is Located |  |  | 7
Number of Real Estate Properties |  | 132 |
Area of Real Estate Property (Square Foot) |  | 374,926 |
Centennial Tech Center [Member] | Subsequent Event [Member] |  |  |
Proceeds from Sale of Real Estate, Total | $ | $ 15,000,000 |  |
Office Properties [Member] |  |  |
Number of Real Estate Properties |  |  | 12
Industrial Office Properties [Member] |  |  |
Number of Real Estate Properties |  |  | 1
Office/Industrial Properties [Member] |  |  |
Area of Real Estate Property (Square Foot) |  | 998,016 | 1,192,566
Retail Properties [Member] |  |  |
Number of Real Estate Properties |  |  | 4
Area of Real Estate Property (Square Foot) |  | 131,722 | 131,722
Model Home Properties [Member] |  |  |
Number of Real Estate Properties |  | 132 | 136
Lessor, Operating Lease, Term of Contract (Month) |  |  | 1 year 180 days
Lessor, Operating Lease, Renewal Term (Month) |  |  | 180 days

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- Definition Term of lessor's operating lease renewal, 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 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919359-209981 + Details
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- 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 + Details
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