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Note 11 - Stockholders' Equity (Details Textual)
 6 Months Ended 12 Months Ended 63 Months Ended 101 Months Ended
Jan. 23, 2012
USD ($)
shares
Jun. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2011
$ / shares
shares
Jun. 30, 2020
USD ($)
$ / shares
shares
Preferred Stock, Shares Authorized (in shares)   1,000,000   1,000,000     1,000,000
Maximum Individual Common Stock Ownership, Percentage   9.80%   9.80%     9.80%
Dividends, Common Stock, Cash | $   $ 0 $ 1,100,000 $ 1,100,000 $ 1,100,000    
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) | $ / shares     $ 0.12 $ 0.12 $ 0.12    
Registered Shares of Common Stock Pursuant to Dividend Reinvestment Plan (in shares) 3,000,000            
Common Stock, Percentage of Pruchase 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            
Dividend Reinvestments | $       $ 0      
Stock Issued During Period, Value, Dividend Reinvestment Plan | $       $ 17,400,000     $ 17,400,000
Stock Issued During Period, Shares, Dividend Reinvestment Plan (in shares)   0   917,074     917,074
Private Placement [Member]              
Stock Issued During Period, Shares, New Issues (in shares)           10,000,000  
Sale of Stock, Price Per Share (in dollars per share) | $ / shares   $ 19       $ 20 $ 19
Common Class A [Member]              
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)   8,925,036   8,881,842 8,860,711   8,925,036
Common Stock, Number of Entitled Votes       1      
Common Class C [Member]              
Common Stock, Shares Authorized (in shares)   9,000,000   9,000,000     9,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares       $ 0.01      
Common Stock, Shares, Issued, Total (in shares)   0   0     0
Common Stock, Number of Entitled Votes   1   1     1
Common Class B [Member]              
Common Stock, Shares Authorized (in shares)   1,000   1,000     1,000
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)       0      
Common Stock, Number of Entitled Votes       1