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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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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
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