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Note 13 - Subsequent Events (Details Textual) |  |  |  | 1 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 28, 2021 USD ($) | Oct. 15, 2021 $ / shares | Jun. 24, 2021 $ / shares | Nov. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Notes Payable, Total |  |  |  |  |  | $ 7,500,086
Property in Baltimore, MD [Member] | Forecast [Member] |  |  |  |  |  |
Real Estate Property, Consideration Transferred, Total |  |  |  | $ 8,700,000 |  |
Subsequent Event [Member] | Model Home Properties in Houston, Texas [Member] |  |  |  |  |  |
Number of Properties Acquired | 3 |  |  |  |  |
Real Estate Property, Consideration Transferred, Total | $ 1,500,000 |  |  |  |  |
Payments to Acquire Residential Real Estate | 500,000 |  |  |  |  |
Subsequent Event [Member] | Model Home Properties in Houston, Texas [Member] | Mortgage Notes [Member] |  |  |  |  |  |
Notes Payable, Total | $ 1,000,000.0 |  |  |  |  |
Series D Preferred Stock [Member] |  |  |  |  |  |
Preferred Stock, Dividends Per Share, Declared (in dollars per share) | $ / shares |  |  | $ 0.10417 |  |  |
Series D Preferred Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |
Preferred Stock, Dividends Per Share, Declared (in dollars per share) | $ / shares |  | $ 0.19531 |  |  |  |
Dividends Payable, Date to be Paid |  | Nov. 15, 2021 |  |  |  |
Dividends Payable, Date of Record |  | Oct. 31, 2021 |  |  |  |

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