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Note 15 - Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Year ended December 31,
 
   
2018
    
2017
    
2016
  
   
(in thousands)
          
Beginning balance
   $
(2,289
 )   $
(4,583
 )   $
(4,049
 )
            $ -          
Other comprehensive income (loss) before reclassifications
    
(1,611
 )    
2,294
      
(534
 )
Amounts reclassified from accumulated other comprehensive loss
    
-
      
-
      
-
  
                         
Ending Balance
   $
(3,900
 )   $
(2,289
 )   $
(4,583
 )