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Note 16 - Accumulated Other Comprehensive Income (Tables)
 6 Months Ended
Jun. 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
    
416
  
Amounts reclassified from AOCI
    
-
  
Net current-period other comprehensive income
    
416
  
Balance as of June 30, 2018
   $
72
  
   
Foreign
Currency
Translation
Adjustments
    
Unrealized
Gains
Related to
Available-
for-Sale
Securities
    
Unrealized
Loss
on Interest
Rate Swaps
    
Total
  
Balance as of January 1, 2017
   $
6,335
     $
406
     $
(975
 )   $
5,766
  
Other comprehensive income before reclassifications
    
1,721
      
(1,619
 )    
205
      
307
  
Amounts reclassified from AOCI
    
-
      
-
      
-
      
-
  
Net current-period other comprehensive income
    
1,721
      
(1,619
 )    
205
      
307
  
Balance as of June 30, 2017
   $
8,056
     $
(1,213
 )   $
(770
 )   $
6,073