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Note 11 - Stockholders' Equity (Details Textual)
 12 Months Ended
Jan. 23, 2012
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2016
Preferred Stock, Shares Authorized (in shares)   1,000,000    
Maximum Individual Common Stock Ownership, Percentage   9.80%    
Dividends, Common Stock, Cash | $   $ 1,000,000.0 $ 1,100,000  
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) | $ / shares   $ 0.10 $ 0.12  
Payments of Dividends, Total | $   $ 1,000,000.0 $ 2,200,000  
Number of Limited Partnerships in which Company is Sole General Partner       1
Number of Limited Liability Companies       4
Number of Put Options Exercised (in shares)   2    
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%      
Shares Issued, Price Per Share (in dollars per share) | $ / shares $ 10.00      
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)   1,834,147    
Common Stock [Member]        
Stock Issued During Period, Shares, New Issues (in shares)   59,274    
Noncontrolling Interest [Member]        
Minority Interest, Decrease from Issuance of Stock for Limited Partnership Interests | $   $ 1,247,990    
Commercial Property [Member] | Wholly Owned Properties [Member]        
Number of Real Estate Properties   15    
Commercial Property [Member] | Partially Owned Properties [Member]        
Number of Real Estate Properties   2    
Redeemable Convertible Preferred Stock Series B [Member]        
Preferred Stock, Shares Issued, Total (in shares)   0 0  
Preferred Stock, Shares Outstanding, Ending Balance (in shares)   0 0  
Common Class A [Member]        
Common Stock, Shares Authorized (in shares)   100,000,000 100,000,000  
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares   $ 0.01 $ 0.01  
Common Stock, Shares, Issued, Total (in shares)   9,508,363 8,881,842  
Common Class B [Member]        
Common Stock, Shares Authorized (in shares)   1,000    
Common Stock, Shares, Issued, Total (in shares)   0    
Common Class C [Member]        
Common Stock, Shares Authorized (in shares)   9,000,000    
Common Stock, Shares, Issued, Total (in shares)   0    
Common Stock, Number of Entitled Votes   1