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Note 10 - Stockholders' Equity (Details Textual)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended 110 Months Ended
Jan. 23, 2012
USD ($)
$ / shares
shares
Mar. 31, 2021
USD ($)
$ / shares
shares
Mar. 31, 2020
USD ($)
Dec. 31, 2016
Mar. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
$ / shares
shares
Preferred Stock, Shares Authorized (in shares)   1,000,000     1,000,000  
Maximum Individual Common Stock Ownership, Percentage   9.80%     9.80%  
Payments of Dividends, Total | $   $ 1,000 $ 0      
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) | $ / shares   $ 0.101        
Number of Limited Liability Companies   2   4 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%          
Shares Issued, Price Per Share (in dollars per share) | $ / shares $ 19.00          
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  
Stock Issued During Period, Shares, Dividend Reinvestment Plan (in shares)         917,074  
Commercial Property [Member]            
Number of Real Estate Properties   13     13  
Commercial Property [Member] | Partially Owned Properties [Member]            
Number of Real Estate Properties   2     2  
Redeemable Convertible Preferred Stock Series B [Member]            
Preferred Stock, Shares Issued, Total (in shares)   0     0 0
Preferred Stock, Shares Outstanding, Ending Balance (in shares)   0     0 0
Common Class A [Member]            
Common Stock, Shares Authorized (in shares)   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
Common Stock, Shares, Issued, Total (in shares)   9,508,363     9,508,363 9,508,363
Common Class B [Member]            
Common Stock, Shares Authorized (in shares)   1,000     1,000  
Common Stock, Shares, Issued, Total (in shares)           0
Common Class C [Member]            
Common Stock, Shares Authorized (in shares)   9,000,000     9,000,000  
Common Stock, Shares, Issued, Total (in shares)   0     0  
Common Stock, Number of Entitled Votes   1     1