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Note 5 - Derivative Instruments and Hedging Activities (Tables)
 6 Months Ended
Jun. 30, 2018
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
 
                         
July - September 2018
    
6,130
      
1.2851
      
(134
 )
October - December 2018
    
6,049
      
1.2802
      
(144
 )
January - March 2019
    
1,640
      
1.2852
      
(30
 )
April - June 2019
    
1,599
      
1.2831
      
(29
 )
July - September 2019
    
1,444
      
1.2809
      
(27
 )
    $
16,862
      
1.2828
     $
(364
 )
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
       
As of
June 30
,
2018
   
As of
December 31,
2017
  
Derivatives
(Dollar amounts in thousands of U.S. dollars)
  
Balance
Sheet
Location
  
Fair Value
Asset
(Liability)
    
Fair Value
Asset
(Liability)
  
                     
Foreign currency forward contracts designated as cash flow hedges (net)
  
Derivative instruments
   $
(321
 )   $
-
  
                     
Foreign currency forward contracts not designated as cash flow hedges (net)
  
Derivative instruments
   $
(43
 )   $
-
  
                     
Total foreign currency forward contracts (net)
  
Derivative instruments
   $
(364
 )   $
-
  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Gains and
losses on cash
flow hedges
    
Tax impact
    
Total AOCI
  
                         
Opening AOCI balance – March 31. 2018
   $
23
     $
(6
)
   $
17
  
                         
Other comprehensive income (loss) before reclassifications
    
(361
)
    
88
      
(273
)
Amount reclassified from accumulated other comprehensive income
    
17
      
(4
)
    
13
  
Other comprehensive income (loss) for the three months ended June 30, 2018
    
(344
)
    
84
      
(260
)
                         
Ending AOCI balance – June 30, 2018
   $
(321
)
   $
78
     $
(243
)
   
Gains and
losses on cash
flow hedges
    
Tax impact
    
Total AOCI
  
                         
Opening AOCI balance – December 31, 2017
   $
—
     $
—
     $
—
  
                         
Other comprehensive income (loss) before reclassifications
    
(338
)
    
82
      
(256
)
Amount reclassified from accumulated other comprehensive income
    
17
      
(4
)
    
13
  
Other comprehensive income (loss) for the six months ended June 30, 2018
    
(321
)
    
78
      
(243
)
                         
Ending AOCI balance – June 30, 2018
   $
(321
)
   $
78
     $
(243
)
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
(Effective
Portion)
  
Location of
Gain or
(Loss)
Reclassified
from
AOCI into
Income
(Effective
Portion)
  
Amount of
Gain or
(Loss)
Reclassified
from
AOCI into
Income,
(Effective
Portion)
  
Location of
Gain or (Loss)
Recognized in
Income on
Derivative
(ineffective
Portion and
Amount
Excluded from
Effectiveness
Testing)
  
Amount of
Gain or
(Loss)
Recognized
in Income on
Derivative
(ineffective
Portion and
Amount
Excluded
from
Effectiveness
Testing)
  
                             
     
 
  
Operating expenses
   $
(1
 )
Operating expenses
   $
—
  
Foreign currency forward contracts for the three months ended June 30, 2018
   $
(260
 )
Cost of revenues
   $
(16
 )
Cost of revenues
    
—
  
                             
     
 
  
Operating expenses
   $
24
  
Operating expenses
   $
—
  
Foreign currency forward contracts for the three months ended June 30, 2017
   $
126
  
Cost of revenues
   $
4
  
Cost of revenues
    
—
  
Derivatives in Cash Flow Hedging Relationship
  
Amount of
Gain or
(Loss)
Recognized
in OCI, net of
tax, on
Derivative
(Effective
Portion)
  
Location of
Gain or
(Loss)
Reclassified
from
Accumulated
OCI into
Income
(Effective
Portion)
  
Amount of
Gain or
(Loss)
Reclassified
from
Accumulated
OCI into
Income,
(Effective
Portion)
  
Location of
Gain or (Loss)
Recognized in
Income on
Derivative
(ineffective
Portion and
Amount
Excluded from
Effectiveness
Testing)
  
Amount of
Gain or
(Loss)
Recognized
in Income on
Derivative
(ineffective
Portion and
Amount
Excluded
from
Effectiveness
Testing)
  
                             
     
 
  
Operating expenses
   $
(1
 )
Operating expenses
   $
—
  
Foreign currency forward contracts for the six months ended June 30, 2018
   $
(243
 )
Cost of revenues
   $
(16
 )
Cost of revenues
    
—
  
                             
                             
     
 
  
Operating expenses
   $
129
  
Operating expenses
   $
—
  
Foreign currency forward contracts for the six months ended June 30, 2017
   $
231
  
Cost of revenues
   $
25
  
Cost of revenues
    
—