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Note 5 - Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Foreign
Currency
Translation
Adjustment
s
    
Defined
Benefit
Pension Pla
n
      
Unrealized
Gain (Loss) on
Cash Flow
Hedge
s
    
Tota
l
  
                                   
Beginning Balance
– January 1, 2017
   $
(28,047
 )   $
(11,040
 )
 
   $
(1,076
)
   $
(40,163
 )
Other comprehensive income (loss) before reclassification
s
    
15,191
      
(591
 )
(1)
    
3,712
(2)
    
18,312
  
Amounts reclassified from AOC
L
    
-
      
653
  
(3)
    
-
 
    
653
  
Net current-period other comprehensive incom
e
    
15,191
      
62
  
 
    
3,712
 
    
18,965
  
Ending Balance
– December 31, 2017
   $
(12,856
 )   $
(10,978
 )
 
   $
2,636
 
   $
(21,198
 )
   
Foreign
Currency
Translation
Adjustment
s
    
Defined
Benefit
Pension Pla
n
      
Unrealized
Gain (Loss) on
Cash Flow
Hedge
s
    
Tota
l
  
                                   
Beginning Balance
– January 1, 2016
   $
(9,502
 )   $
(11,362
 )
 
   $
(1,611
)
   $
(22,475
 )
Other comprehensive income (loss) before reclassification
s
    
(18,545
 )    
(273
 )
(4)
    
535
(5)
    
(18,283
 )
Amounts reclassified from AOC
L
    
-
      
595
  
(6)
    
-
 
    
595
  
Net current-period other comprehensive income (loss
)
    
(18,545
 )    
322
  
 
    
535
 
    
(17,688
 )
Ending Balance
– December 31, 2016
   $
(28,047
 )   $
(11,040
 )
 
   $
(1,076
)
   $
(40,163
 )