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Note 13 - Investments in Unconsolidated Joint Ventures (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Condensed Financial Statements [Table Text Block]
    June 30, 2017
    City of Athens   Eco Nine
Current assets  
37
    
37
  
Non-current assets  
4,740
    
3,136
  
Current liabilities  
-
    
-
  
Long-term liabilities  
-
    
-
  
Net operating revenues  
-
    
-
  
Net loss  
(2
 )  
(18
 )