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Note 4 - Investment in Affiliate (Tables)
 3 Months Ended
Mar. 31, 2020
Notes Tables  
Equity Method Investments [Table Text Block]
   
Ownership %
  
Investment in Affiliate
Balance
  
Loss recorded in
the Statements
of Operations (b)
  
                         
For the Three
Months Ended
March 31,
  
   
March 31,
2020
  
December 31,
2019
  
March 31,
2020
    
December 31,
2019
  
2020
    
2019
  
                                       
HC Realty Series B Stock (a)
  
7.7%
  
7.9%
   $
2,000
     $
2,000
   $
-
     $
-
  
HC Realty common stock
  
8.3%
  
8.5%
    
2,256
      
2,405
    
(108
 )    
(19
 )
Total
  
16.0%
  
16.4%
  
$
4,256
     $
4,405
  
$
(108
)
   $
(19
 )