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Note 10 - Stockholders' Equity (Details Textual)
 12 Months Ended 143 Months Ended
Jul. 12, 2021
$ / shares
shares
Jun. 17, 2021
USD ($)
shares
Jun. 17, 2021
USD ($)
shares
Jun. 15, 2021
USD ($)
$ / shares
shares
Jan. 23, 2012
USD ($)
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 01, 2023
USD ($)
Sep. 15, 2022
USD ($)
Jan. 21, 2022
$ / shares
shares
Sep. 17, 2021
USD ($)
Aug. 31, 2021
$ / shares
shares
Preferred Stock, Shares Authorized (in shares)           1,000,000   1,000,000          
Shares Issued, Price Per Share (in dollars per share) | $ / shares         $ 19                
Maximum Individual Common Stock Ownership, Percentage           9.80%   9.80%          
Number of Limited Partnerships in which Company is Sole General Partner           5              
Registered Shares of Common Stock Pursuant to Dividend Reinvestment Plan (in shares)         3,000,000                
Common Stock, Percentage of Purchase Price Per Share         95.00%                
Payment of Sales, Commission or Dealer Manager Fee | $         $ 0                
Notice Period for Amendments to Dividend Reinvestment Plan (Day)         30 days                
Stock Issued During Period, Value, Dividend Reinvestment Plan | $               $ 17,400,000          
Stock Issued During Period, Shares, Dividend Reinvestment Plan (in shares)               917,074          
Commercial Property [Member]                          
Number of Real Estate Properties           12   12          
Commercial Property [Member] | Partially Owned Properties [Member]                          
Number of Real Estate Properties           2   2          
Class A Common Stock and Accompanying Common Stock Warrants [Member]                          
Shares Issued, Price Per Share (in dollars per share) | $ / shares $ 5                        
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) 2,000,000                        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares $ 5.5                        
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) 1,000,000                        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares $ 0.01                        
Placement Agent Warrants [Member]                          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in 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, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares                     $ 0.17    
Class of Warrant or Right, Exercised During Period (in shares)           0              
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)                     0.1    
Series A Warrants [Member]                          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares                     $ 7    
Warrants and Rights Outstanding, Term (Year)                     5 years    
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)                     1    
Class of Warrant or Right, Outstanding (in shares)                     14,450,069    
Series D Preferred Stock [Member]                          
Preferred Stock, Shares Authorized (in shares)           1,000,000 1,000,000 1,000,000          
Stock Issued During Period, Shares, New Issues (in shares)   920,000   800,000                  
Shares Issued, Price Per Share (in dollars per share) | $ / shares       $ 25                  
Proceeds from Issuance of Preferred Stock and Preference Stock | $   $ 20,500,000   $ 18,100,000                  
Preferred Stock, Dividend Rate, Percentage           9.375%              
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ / shares           $ 25 $ 25 $ 25          
Preferred Stock, Dividend Rate, Per-Dollar-Amount (in dollars per share) | $ / shares           $ 2.34375              
Preferred Stock, Number of Board of Directors Entitled to Vote if Dividends not Paid for 18 Monthly Dividend Periods           2   2          
Preferred Stock, Percentage of Outstanding Shares Required to Authorize Senior Ranking Stock           66.67%   66.67%          
Preferred Stock, Redemption Price Per Share (in dollars per share) | $ / shares           $ 25   $ 25          
Preferred Stock, Dividends Per Share, Declared (in dollars per share) | $ / shares           $ 2.34372 $ 2.34372            
Payments of Dividends | $           $ 2,100,000 $ 2,200,000            
Stock Repurchase Program, Authorized Amount | $                 $ 4,000,000 $ 4,000,000      
Stock Repurchased During Period, Shares (in shares)           23,041 6,013            
Stock Repurchased, Average Cost Per Share (in dollars per share) | $ / shares           $ 15.97 $ 20.31            
Stock Repurchased, Commission Per Share (in dollars per share) | $ / shares           $ 0.035 $ 0.035            
Stock Repurchased During Period, Value | $           $ 200,000 $ 122,141            
Series D Preferred Stock [Member] | Monthly Dividends [Member]                          
Preferred Stock, Dividends Per Share, Declared (in dollars per share) | $ / shares           $ 0.19531              
Series D Preferred Stock [Member] | Over-Allotment Option [Member]                          
Stock Issued During Period, Shares, New Issues (in shares)     120,000                    
Proceeds from Issuance of Preferred Stock and Preference Stock | $     $ 2,700,000                    
Option to Purchase Additional Shares, Period (Day)       45 days                  
Common Class A [Member]                          
Stock Issued During Period, Shares, New Issues (in shares) 1,000,000                        
Payments of Dividends | $           $ 1,200,000 $ 3,100,000            
Common Stock, Shares Authorized (in shares)           100,000,000 100,000,000 100,000,000          
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares           $ 0.01 $ 0.01 $ 0.01          
Common Stock, Shares, Issued (in shares)           11,859,726 11,807,893 11,859,726          
Stock Repurchase Program, Authorized Amount | $                 $ 6,000,000 $ 6,000,000   $ 10,000,000  
Stock Repurchased During Period, Shares (in shares)             196,631            
Stock Repurchased, Average Cost Per Share (in dollars per share) | $ / shares             $ 1.59            
Stock Repurchased, Commission Per Share (in dollars per share) | $ / shares             $ 0.035            
Stock Repurchased During Period, Value | $             $ 313,578            
Common Class B [Member]                          
Common Stock, Shares Authorized (in shares)           1,000   1,000          
Common Stock, Shares, Issued (in shares)           0   0          
Common Class C [Member]                          
Common Stock, Shares Authorized (in shares)           9,000,000   9,000,000          
Common Stock, Shares, Issued (in shares)           0   0          
Common Stock, Number of Entitled Votes           1   1