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Note 10 - Stockholders' Equity (Details Textual)
 1 Months Ended 6 Months Ended 12 Months Ended 119 Months Ended
Jul. 12, 2021
$ / shares
shares
Jun. 24, 2021
$ / 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
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2016
Dec. 31, 2021
USD ($)
$ / shares
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     1,000,000    
Shares Issued, Price Per Share (in dollars per share) | $ / shares           $ 19.00                  
Proceeds from Issuance of Preferred Stock and Preference Stock | $                   $ 20,489,803 $ 0        
Maximum Individual Common Stock Ownership, Percentage             9.80%   9.80% 9.80%     9.80%    
Payments of Dividends, Total | $                   $ 4,500,000 $ 1,100,000        
Number of Limited Liability Companies             2   2 2   5 2    
Number of Limited Partnerships in which Company is Sole General Partner                       1      
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 | $                   $ 0     $ 17,400,000    
Stock Issued During Period, Shares, Dividend Reinvestment Plan (in shares)                     0   917,074    
Commercial Property [Member]                              
Number of Real Estate Properties             13   13 13     13    
Commercial Property [Member] | Partially Owned Properties [Member]                              
Number of Real Estate Properties             2   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                            
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                           $ 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 D Preferred Stock [Member]                              
Preferred Stock, Shares Authorized (in 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)     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     2    
Preferred Stock, Percentage of Outstanding Shares Required to Authorize Senior Ranking Stock             66.67%   66.67% 66.67%     66.67%    
Preferred Stock, Redemption Price Per Share (in dollars per share) | $ / shares             $ 25.00   $ 25.00 $ 25.00     $ 25.00    
Preferred Stock, Dividends Per Share, Declared (in dollars per share) | $ / shares   $ 0.10417               $ 1.27603 $ 0        
Dividends, Preferred Stock, Cash | $                 $ 1,000,000.0            
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                            
Common Stock, Shares Authorized (in 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)             11,599,720   11,599,720 11,599,720 9,508,363   11,599,720    
Stock Repurchase Program, Authorized Amount | $                           $ 10,000,000  
Stock Repurchased During Period, Shares (in shares)             11,588 18,133              
Stock Repurchased, Average Cost Per Share (in dollars per share) | $ / shares             $ 3.6097 $ 3.73692              
Stock Repurchased, Commission Per Share (in dollars per share) | $ / shares             $ 0.035 $ 0.035              
Stock Repurchased During Period, Value | $             $ 42,235 $ 68,396              
Common Class B [Member]                              
Common Stock, Shares Authorized (in shares)             1,000   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     9,000,000    
Common Stock, Shares, Issued, Total (in shares)             0   0 0     0    
Common Stock, Number of Entitled Votes             1   1 1     1