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Note 5 - Investment in Affiliate (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Equity Method Investments [Table Text Block]
   
Ownership %
    
Investment in Affiliate
Balance
    
Loss recorded in
the Consolidated
Statements of
Operations (b)
  
   
December
31, 2020
    
December
31, 2019
    
December
31, 2020
    
December
31, 2019
    
 
2020
    
 
2019
  
                                                 
HC Realty Series B Stock (a)
    
28.7
 %    
7.9
 %   $
10,250
     $
2,000
     $
-
     $
-
  
HC Realty common stock
    
7.7
 %    
8.5
 %    
1,822
      
2,405
      
(418
 )    
(430
 )
Total
  
 
36.4
%
    
16.4
 %  
$
12,072
     $
4,405
    
$
(418
)
   $
(430
 )