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Note 10 - Stockholders' Equity (Details Textual)
 1 Months Ended 3 Months Ended 6 Months Ended 125 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, 2021
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Jun. 30, 2022
USD ($)
$ / shares
shares
Mar. 31, 2022
shares
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
$ / shares
shares
Jun. 30, 2021
USD ($)
$ / shares
Jun. 30, 2022
USD ($)
$ / shares
shares
Jan. 24, 2022
$ / shares
Jan. 21, 2022
$ / shares
Sep. 17, 2021
USD ($)
Aug. 31, 2021
$ / shares
shares
Preferred Stock, Shares Authorized (in 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)         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] | 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) 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) 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)                                 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)             0       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)           1,000,000   1,000,000     1,000,000   1,000,000        
Stock Issued During Period, Shares, New Issues (in 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        
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                     $ 1.17186 $ 0.10417          
Payments of Dividends, Total | $               $ 500,000     $ 1,100,000            
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, Total | $               $ 1,300,000   $ 1,000,000.0 $ 2,600,000 $ 2,000,000.0          
Common Stock, Shares Authorized (in shares)           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        
Common Stock, Shares, Issued, Total (in shares)           11,599,720   11,793,757     11,793,757   11,793,757        
Stock Repurchase Program, Authorized Amount | $                               $ 10,000,000  
Stock Repurchased During Period, Shares (in shares)           11,588 18,133 10,411 0                
Stock Repurchased, Average Cost Per Share (in dollars per share) | $ / shares           $ 3.6097 $ 3.73692 $ 2.9698                  
Stock Repurchased, Commission Per Share (in dollars per share) | $ / shares           $ 0.035 $ 0.035                    
Stock Repurchased During Period, Value | $           $ 42,235 $ 68,396 $ 30,919                  
Common Class B [Member]                                  
Common Stock, Shares Authorized (in shares)               1,000     1,000   1,000        
Common Class C [Member]                                  
Common Stock, Shares Authorized (in shares)               9,000,000     9,000,000   9,000,000        
Common Stock, Shares, Issued, Total (in shares)               0     0   0        
Common Stock, Number of Entitled Votes               1     1   1