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Note 15 - Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
March 31, 2019
     December 31, 2018  
                 
Beginning Balance
  
$
(8,190
)
   $
(6,492
 )
                 
Other Comprehensive Income Before Reclassification
  
 
3,163
     
(1,607
 )
                 
Amounts Reclassified from Accumulated Other Comprehensive Income
  
 
-
     
(91
 )
                 
Net Current Period Other Comprehensive Income
  
 
3,163
     
(1,698
 )
                 
Ending Balance
  
$
(5,027
)
   $
(8,190
 )