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v3.21.1

Note 1 - Organization (Details Textual) |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 06, 2020 USD ($) $ / shares shares | Jul. 29, 2020 | Mar. 31, 2021 USD ($) | Dec. 31, 2016 | Dec. 31, 2020 USD ($) | Sep. 30, 2020 | Sep. 01, 2020 USD ($) | Sep. 17, 2019 USD ($) | Jan. 23, 2012 $ / shares
Number of Limited Liability Companies |  |  | 2 | 4 |  |  |  |  |
Number of Limited Partnerships in which Company is Sole General Partner |  |  |  | 1 |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 19.00
Long-Term Debt, Maturity, Remainder of Fiscal Year |  |  | $ 11,346,851 |  |  |  |  |  |
Mortgage Notes [Member] |  |  |  |  |  |  |  |  |
Long-Term Debt, Maturity, Remainder of Fiscal Year |  |  | $ 11,300,000 |  |  |  |  |  |
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% |
Reverse Stock Split [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio |  | 2 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
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 |  |  | 13 |  |  |  |  |  |
Commercial Property [Member] | Partially Owned Properties [Member] |  |  |  |  |  |  |  |  |
Number of Real Estate Properties, Fee Simple |  |  | 2 |  |  |  |  |  |
Model Home [Member] | Mortgage Notes [Member] |  |  |  |  |  |  |  |  |
Long-Term Debt, Maturity, Remainder of Fiscal Year |  |  | $ 4,400,000 |  |  |  |  |  |
World Plaza [Member] | Mortgage Notes [Member] |  |  |  |  |  |  |  |  |
Long-Term Debt, Maturity, Remainder of Fiscal Year |  |  | $ 5,800,000 |  |  |  |  |  |
Debt Instrument, Term of Extension Options (Year) |  |  | 1 year |  |  |  |  |  |

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