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Note 1 - Organization (Details Textual) |  |  |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 12, 2021 $ / shares shares | Jun. 17, 2021 USD ($) shares | Jun. 17, 2021 USD ($) shares | Jun. 15, 2021 USD ($) $ / shares shares | Oct. 06, 2020 USD ($) $ / shares shares | Jul. 29, 2020 | Sep. 30, 2021 USD ($) shares | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2016 | Aug. 31, 2021 $ / shares shares | Apr. 27, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 01, 2020 USD ($) | Sep. 17, 2019 USD ($) | Jan. 23, 2012 $ / shares
Number of Limited Liability Companies |  |  |  |  |  |  | 2 | 2 |  | 5 |  |  |  |  |  |
Number of Limited Partnerships in which Company is Sole General Partner |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19.00
Proceeds from Issuance of Common Stock |  |  |  |  |  |  |  | $ 8,871,879 | $ 0 |  |  |  |  |  |  |
Equity Offering, Maximum Gross Proceeds |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock |  |  |  |  |  |  |  | 20,489,803 | $ 0 |  |  |  |  |  |  |
Long-Term Debt, Maturity, Remainder of Fiscal Year |  |  |  |  |  |  | $ 942,863 | 942,863 |  |  |  |  |  |  |  |
Mortgage Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt, Maturity, Remainder of Fiscal Year |  |  |  |  |  |  | $ 900,000 | $ 900,000 |  |  |  |  |  |  |  |
Polar Multi-Strategy Master Fund [Member] | Notes Payable to Banks [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,000,000.0 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% |
Long-term Debt, Total |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,700,000 | $ 8,800,000 |  |
Debt Instrument, Renewal Fee Percentage |  |  |  |  |  |  |  |  | 4.00% |  |  |  |  |  | 4.00% |
Class A Common Stock and Accompanying Common Stock Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ / shares | $ 5.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Common Stock and Accompanying Pre-funded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ / shares | $ 4.99 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | $ 5.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-funded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | $ 0.01 |  |  |  |  |  |  |  |  |  | $ 0.01 |  |  |  |  |
Placement Agent Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 80,000 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 6.25 |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |
Class of Warrant or Right, Securities Called By Warrants or Rights, Percentage of Class of Stock |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  |  |  |
Common Stock Warrants and Placement Agent Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) | shares |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | shares | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series D Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | shares |  | 920,000 |  | 800,000 |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ / shares |  |  |  | $ 25.00 |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  | 9.375% |  |  |  | 9.375% |  |  |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock |  | $ 20,500,000 |  | $ 18,100,000 |  |  |  |  |  |  |  |  |  |  |  |
IPO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | shares |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ / shares |  |  |  |  | $ 5.00 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  |  |  | $ 2,000,000.0 |  |  |  |  |  |  |  |  |  |  |
IPO [Member] | Underwriting Discounts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |
IPO [Member] | Other Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs |  |  |  |  | $ 500,000 |  |  |  |  |  |  |  |  |  |  |
Over-Allotment Option [Member] | Series D Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | shares |  |  | 120,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock |  |  | $ 2,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Option to Purchase Additional Shares, Period (Day) |  |  |  | 45 days |  |  |  |  |  |  |  |  |  |  |  |
Reverse Stock Split [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Model Home Properties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Limited Partnerships in which Company is Sole General Partner |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |
Commercial Property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties, Fee Simple |  |  |  |  |  |  | 12 | 12 |  |  |  |  |  |  |  |
Commercial Property [Member] | Partially Owned Properties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties, Fee Simple |  |  |  |  |  |  | 2 | 2 |  |  |  |  |  |  |  |
Model Home [Member] | Mortgage Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt, Maturity, Remainder of Fiscal Year |  |  |  |  |  |  | $ 600,000 | $ 600,000 |  |  |  |  |  |  |  |

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