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Note 15 - Accumulated Other Comprehensive Income ("AOCI") (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Foreign
Currency
Translation Adjustments
    
Unrealized
Gain
/(
L
oss)
on
Available-for-
Sale
Investments
    
Unrealized
Loss
on Interest
Rate Swaps
    
Total
  
Balance as of January 1,
2017
   $
6,335
     $
406
     $
(975
 )   $
5,766
  
Other comprehensive income before reclassifications
    
3,711
      
(1,466
 )    
308
      
2,553
  
Amounts reclassified from AOCI
(1)
    
(10,046
 )    
-
      
-
      
(10,046
 )
Net current-period other comprehensive income
    
(6,335
 )    
(1,466
 )    
308
      
(7,493
 )
Balance as of
September 30, 2017
   $
-
     $
(1,060
 )   $
(667
 )   $
(1,727
 )
   
Foreign
Currency
Translation Adjustments
    
Unrealized
Gains on
Available-for-
Sale
Investments
    
Unrealized
Loss
on Interest
Rate Swaps
    
Total
  
Balance as of January 1, 201
6
   $
6,616
     $
398
     $
(1,426
 )   $
5,588
  
Ot
her comprehensive income
before
reclassifications
    
971
      
18
      
(432
 )    
557
  
Amounts reclassified from AOCI
    
-
      
-
      
-
      
-
  
Net current-period other comprehensive income
    
971
      
18
      
(432
 )    
557
  
Balance as of
September 30, 2016
   $
7,587
     $
416
     $
(1,858
 )   $
6,145