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Note 18 - Financial instruments (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
    December 31
    2018   2017
    Carrying
Amount		   Fair
Value		   Carrying
Amount		   Fair
Value
Assets                
Cash and cash equivalents   $
32,414
     $
32,414
     $
28,520
     $
28,520
  
Restricted cash    
34
      
34
      
35
      
35
  
Short-term investments    
6,172
      
6,172
      
17,601
      
17,601
  
Long-term investments    
10,445
      
10,445
      
3,112
      
3,112