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Note 1 - Organization and Basis of Presentation (Details Textual) | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 | Sep. 17, 2019 USD ($) | Dec. 31, 2016
Number of Real Estate Properties, Fee Simple |  | 16 |  |  |
Number of Limited Liability Companies |  |  |  |  | 4
Long-Term Debt, Maturity, Year One | $ 29,091,117 | $ 29,166,847 |  |  |
Number of Reportable Segments | 3 | 3 |  |  |
Customer Concentration Risk [Member] | Rental Income [Member] |  |  |  |  |
Number of Tenants |  | 1 | 1 |  |
Concentration Risk, Percentage |  | 6.10% | 5.70% |  |
Mortgage Notes [Member] |  |  |  |  |
Long-Term Debt, Maturity, Year One | $ 29,100,000 |  |  |  |
Mortgage Notes [Member] | Model Home [Member] |  |  |  |  |
Long-Term Debt, Maturity, Year One |  | $ 12,300,000 |  |  |
Mortgage Notes [Member] | Commercial Property [Member] |  |  |  |  |
Long-Term Debt, Maturity, Year One |  | $ 16,900,000 |  |  |
Polar Multi-Strategy Master Fund [Member] | Notes Payable to Banks [Member] |  |  |  |  |
Long-term Debt, Total |  |  |  | $ 14,000,000 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 8.00% |
Partially Owned Properties [Member] |  |  |  |  |
Number of Limited Liability Companies |  | 1 |  |  |

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