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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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