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Note 10 - Stockholders' Equity (Details Textual)
 1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 116 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
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
Dec. 31, 2016
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 17, 2021
USD ($)
Aug. 31, 2021
$ / shares
shares
Dec. 31, 2020
$ / shares
shares
Preferred Stock, Shares Authorized (in shares)             1,000,000 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%     9.80%      
Payments of Dividends, Total | $                     $ 0          
Number of Limited Liability Companies             2 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)                         917,074      
Commercial Property [Member]                                
Number of Real Estate Properties             12 12 12 12     12      
Commercial Property [Member] | Partially Owned Properties [Member]                                
Number of Real Estate Properties             2 2 2 2     2      
Dividend One [Member]                                
Payments of Dividends, Total | $                   $ 1,000,000.0            
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) | $ / shares                   $ 0.101            
Dividend Two [Member]                                
Payments of Dividends, Total | $                   $ 1,000,000.0            
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) | $ / shares                   $ 0.102            
Dividend Three [Member]                                
Payments of Dividends, Total | $                   $ 1,200,000            
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) | $ / shares                   $ 0.103            
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                  
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     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         $ 25.00                      
Proceeds from Issuance of Preferred Stock and Preference Stock | $     $ 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     $ 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     2      
Preferred Stock, Percentage of Outstanding Shares Required to Authorize Senior Ranking Stock             66.67% 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     $ 25.00      
Preferred Stock, Dividends Per Share, Declared (in dollars per share) | $ / shares   $ 0.10417                            
Dividends, Preferred Stock, Cash | $               $ 455,207                
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     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     $ 0.01
Common Stock, Shares, Issued, Total (in shares)             11,490,230 11,490,230 11,490,230 11,490,230     11,490,230     9,508,363
Stock Repurchase Program, Authorized Amount | $                           $ 10,000,000    
Stock Repurchased During Period, Shares (in shares)             18,133                  
Stock Repurchased, Average Cost Per Share (in dollars per share) | $ / shares             $ 3.73692                  
Stock Repurchased, Commission Per Share (in dollars per share) | $ / shares             $ 0.035                  
Stock Repurchased During Period, Value | $             $ 68,396                  
Common Class B [Member]                                
Common Stock, Shares Authorized (in shares)             1,000 1,000 1,000 1,000     1,000      
Common Stock, Shares, Issued, Total (in shares)             0 0 0 0     0      
Common Class C [Member]                                
Common Stock, Shares Authorized (in shares)             9,000,000 9,000,000 9,000,000 9,000,000     9,000,000      
Common Stock, Shares, Issued, Total (in shares)             0 0 0 0     0      
Common Stock, Number of Entitled Votes             1 1 1 1     1