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Note 5 - Derivative Instruments and Hedging Activities (Tables)
 3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Derivative Instruments [Table Text Block]
Maturity date (Dollar amounts in thousands of U.S. dollars)
  
Notional amount of U.S. dollars
    
Weighted average exchange rate of U.S. dollars
    
Fair value
  
                         
April - June 2020    
9,653
      
1.3296
      
(526
 )
July - September 2020    
10,656
      
1.3227
      
(627
 )
October - December 2020    
9,658
      
1.3227
      
(565
 )
January - March 2021    
11,124
      
1.4283
      
172
  
April - June 2021    
9,878
      
1.4283
      
150
  
July - September 2021    
10,782
      
1.4362
      
220
  
    $
61,751
      
1.3795
     $
(1,176
 )
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Derivatives (Dollar amounts in thousands of U.S. dollars)
  
Balance Sheet Location
  
As of March 31, 2020 Fair Value Liability
    
As of December 31, 2019 Fair Value Asset
  
Foreign Currency forward contracts designated as cash flow hedges (net)  
Derivative instruments
   $
(932
 )   $
626
  
Foreign Currency forward contracts not designated as cash flow hedges (net)  
Derivative instruments
    
(244
 )    
105
  
Total foreign currency forward contracts (net)  
Derivative instruments
   $
(1,176
 )   $
731
  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Gains and losses on cash flow hedges
    
Tax impact
    
Total AOCI
  
Opening AOCI balance - December 31, 2019   $
625
     $
(152
 )   $
473
  
Other comprehensive income (loss) before reclassifications    
(1,615
 )    
381
      
(1,234
 )
Amount reclassified from AOCI    
58
      
(15
 )    
43
  
Other comprehensive income (loss) for the three months ended March 31, 2020    
(1,557
 )    
366
      
(1,191
 )
                         
Ending AOCI Balance - March 31, 2020   $
(932
 )   $
214
     $
(718
 )
Derivative Instruments, Gain (Loss) [Table Text Block]
Derivatives in Cash Flow Hedging Relationship
  
Amount of Gain or (Loss) Recognized in OCI, net of tax, on Derivative
  
Location of Gain or (Loss) Reclassified from AOCI into Income
  
Amount of Gain or (Loss) Reclassified from AOCI into Income
  
     
 
  
Operating expenses
   $
(45
 )
Foreign currency forward contracts for the three months ended March 31, 2020   $
(1,191
 )
Cost of revenues
   $
(13
 )
                   
     
 
  
Operating expenses
   $
(64
 )
Foreign currency forward contracts for the three months ended March 31, 2019   $
610
  
Cost of revenues
   $
(15
 )
Derivatives Not Designated as Hedging Instruments [Table Text Block]
   
March 31, 2020
    
March 31, 2019
  
Forward currency contracts not designated as hedges:
  
Three months ended
    
Three months ended
  
                 
Gain (loss) on settlement
   $
(93
 )   $
(39
 )
                 
Gain (loss) on change in fair value
   $
(348
 )   $
118