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Note 16 - Accumulated Other Comprehensive Income (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Unrealized
Gain/(
Loss
)
on Interest Rate Swap
  
Balance as of January 1, 2018, as adjusted
   $
(344
 )
Other comprehensive income before reclassifications
    
437
  
Amounts reclassified from AOCI (1)
    
(93
 )
Net current-period other comprehensive income
    
344
  
Balance as of September 30, 2018
   $
-
  
   
Foreign
Currency
Translation
Adjustments
    
Unrealized
Gains
Related to 
Available-
for-Sale
Securities
    
Unrealized
Loss
on Interest
Rate Swap
    
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
 )