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Note 1 - Organization and Basis of Presentation (Details Textual)
 1 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
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
Dec. 31, 2016
Aug. 31, 2021
$ / shares
shares
Apr. 27, 2021
USD ($)
Sep. 30, 2020
Sep. 01, 2020
USD ($)
Sep. 17, 2019
USD ($)
Jan. 23, 2012
$ / shares
Number of Limited Liability Companies               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               $ 0 $ 2,050,000              
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, Year One               $ 12,211,155                
Number of Reportable Segments               3                
Customer Concentration Risk [Member] | Rental Income [Member]                                
Number of Tenants               1 1              
Customer Concentration Risk [Member] | Rental Income [Member] | One Tenant [Member]                                
Concentration Risk, Percentage               8.00% 6.20%              
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%      
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 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   920,000 920,000 800,000                        
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                        
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               13                
Commercial Property [Member] | Mortgage Notes [Member]                                
Long-Term Debt, Maturity, Year One               $ 1,400,000                
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, Year One               $ 4,400,000