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Note 10 - Stockholders' Equity (Details Textual)
 3 Months Ended 4 Months Ended 9 Months Ended 12 Months Ended 128 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
Sep. 30, 2022
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
$ / shares
shares
Sep. 30, 2022
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
Dec. 31, 2021
$ / shares
shares
Sep. 30, 2022
USD ($)
$ / shares
shares
Sep. 15, 2022
USD ($)
Jan. 24, 2022
$ / shares
Jan. 21, 2022
$ / shares
Sep. 17, 2021
USD ($)
Aug. 31, 2021
$ / shares
shares
Preferred Stock, Shares Authorized (in shares) | shares           1,000,000     1,000,000     1,000,000          
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              
Maximum Individual Common Stock Ownership, Percentage           9.80%     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) | 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) | shares                       917,074          
Commercial Property [Member] | Partially Owned Properties [Member]                                  
Number of Real Estate Properties           2     2     2          
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                
Series A Warrants [Member]                                  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares           $ 7.00     $ 7.00     $ 7.00   $ 0.17 $ 7.00    
Warrants and Rights Outstanding, Term (Year)                             5 years    
Series D Preferred Stock [Member]                                  
Preferred Stock, Shares Authorized (in shares) | shares           1,000,000   1,000,000 1,000,000   1,000,000 1,000,000          
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                          
Proceeds from Issuance of Preferred Stock and Preference Stock | $   $ 20,500,000 $ 20,500,000 $ 18,100,000                          
Preferred Stock, Dividend Rate, Percentage       9.375%         9.375%                
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ / shares           $ 25.00   $ 25.00 $ 25.00   $ 25.00 $ 25.00          
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     2          
Preferred Stock, Percentage of Outstanding Shares Required to Authorize Senior Ranking Stock           66.67%     66.67%     66.67%          
Preferred Stock, Redemption Price Per Share (in dollars per share) | $ / shares           $ 25.00     $ 25.00     $ 25.00          
Preferred Stock, Dividends Per Share, Declared (in dollars per share) | $ / shares                 $ 1.75779   $ 0.69010            
Payments of Dividends, Total | $           $ 500,000     $ 1,600,000                
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $                         $ 4,000,000        
Stock Repurchased During Period, Shares (in shares) | shares                 3,933                
Stock Repurchased, Average Cost Per Share (in dollars per share) | $ / shares                 $ 21.42330                
Stock Repurchased, Commission Per Share (in dollars per share) | $ / shares                 $ 0.035                
Stock Repurchased During Period, Value | $                 $ 84,386                
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) | 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) | shares 1,000,000                                
Payments of Dividends, Total | $           $ 200,000 $ 1,200,000   $ 2,900,000 $ 4,500,000              
Common Stock, Shares Authorized (in shares) | shares           100,000,000   100,000,000 100,000,000   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   $ 0.01 $ 0.01          
Common Stock, Shares, Issued, Total (in shares) | shares           11,655,583   11,599,720 11,655,583   11,599,720 11,655,583          
Stock Repurchase Program, Authorized Amount | $                               $ 10,000,000  
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $                         $ 6,000,000        
Stock Repurchased During Period, Shares (in shares) | shares                 161,605   29,721            
Stock Repurchased, Average Cost Per Share (in dollars per share) | $ / shares                 $ 1.71953   $ 3.7223            
Stock Repurchased, Commission Per Share (in dollars per share) | $ / shares                 $ 0.035   $ 0.035            
Stock Repurchased During Period, Value | $               $ 110,631 $ 277,885                
Common Class B [Member]                                  
Common Stock, Shares Authorized (in shares) | shares           1,000     1,000     1,000          
Common Class C [Member]                                  
Common Stock, Shares Authorized (in shares) | shares           9,000,000     9,000,000     9,000,000          
Common Stock, Shares, Issued, Total (in shares) | shares           0     0     0          
Common Stock, Number of Entitled Votes           1     1     1