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Note 1 - Organization and Basis of Presentation (Details Textual)
 12 Months Ended
Jul. 12, 2021
$ / shares
shares
Jun. 17, 2021
USD ($)
shares
Jun. 17, 2021
USD ($)
shares
Jun. 15, 2021
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
a
$ / shares
shares
Dec. 31, 2021
USD ($)
Sep. 30, 2022
USD ($)
Jan. 24, 2022
$ / shares
shares
Jan. 21, 2022
$ / shares
shares
Aug. 31, 2021
$ / shares
shares
Apr. 27, 2021
USD ($)
Jan. 23, 2012
$ / shares
Number of Limited Liability Companies         2              
Number of Limited Partnerships in which Company is Sole General Partner         5              
Equity Offering, Maximum Gross Proceeds | $                     $ 200,000,000  
Shares Issued, Price Per Share (in dollars per share) | $ / shares                       $ 19.00
Proceeds from Issuance of Preferred Stock and Preference Stock | $         $ 0 $ 20,489,803            
Long-Term Debt, Maturity, Year One | $         $ 8,270,149              
Number of Reportable Segments         3              
Restricted Cash, Total | $         $ 4,400,000 $ 4,700,000            
Customer Concentration Risk [Member] | Rental Income [Member]                        
Number of Tenants         1              
Customer Concentration Risk [Member] | Rental Income [Member] | One Tenant [Member]                        
Concentration Risk, Percentage         8.57% 8.00%            
Mortgage Notes [Member]                        
Long-Term Debt, Maturity, Year One | $         $ 8,300,000              
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                 $ 5.50    
Warrants and Rights Outstanding, Term (Year) 5 years                 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              
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) | shares                 0.10      
Series A Warrants [Member]                        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares         $ 7.00     $ 0.17 $ 7.00      
Warrants and Rights Outstanding, Term (Year)                 5 years      
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) | shares                 1      
Class of Warrant or Right, Outstanding (in shares) | shares               14,450,069        
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   920,000 920,000 800,000                
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 $ 20,500,000 $ 18,100,000                
Series D Preferred Stock [Member] | Over-Allotment Option [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                
Model Home Properties [Member]                        
Number of Limited Partnerships in which Company is Sole General Partner         5              
Commercial Property [Member]                        
Number of Real Estate Properties, Fee Simple         12              
Commercial Property [Member] | Partially Owned Properties [Member]                        
Number of Real Estate Properties, Fee Simple         2              
Mortgage Notes [Member] | Mortgage Notes [Member]                        
Long-Term Debt, Maturity, Year One | $         $ 6,800,000              
Mortgage Note, Due June 11, 2022 [Member] | The 300 N.P [Member]                        
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid | $             $ 2,200,000          
Shea Center II [Member]                        
Restricted Cash, Total | $         $ 1,100,000              
Area of Real Estate Property (Acre) | a         45,535