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Note 7 - Derivative Instruments and Hedging Activities (Tables)
 12 Months Ended
Dec. 31, 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
 
                         
January - March 2019
    
9,955
      
1.3131
      
355
  
April - June 2019
    
10,381
      
1.3154
      
332
  
July - September 2019
    
9,881
      
1.3136
      
310
  
October - December 2019
    
10,327
      
1.3174
      
279
  
    $
40,544
      
1.3149
     $
1,276
  
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
  
December 31,

2018

Liability
at
Fair Value
    
December 31,

2017

Liability
at
Fair Value
  
                   
Foreign currency forward contracts designated as cash flow hedges
Derivative instruments
   $
1,069
     $
—
  
                   
Foreign currency forward contracts not designated as cash flow hedges
Derivative instruments
   $
207
     $
—
  
                   
Total foreign currency forward contracts
Derivative instruments
   $
1,276
     $
—
  
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, 2017
   $
—
     $
—
     $
—
  
                         
Other comprehensive income (loss) before reclassifications
    
(1,350
)
    
328
      
(1,022
)
Amount reclassified from accumulated other comprehensive income
    
281
      
(69
)
    
212
  
Other comprehensive income (loss) for the year ended December 31, 2018
    
(1,069
)
    
259
      
(810
)
                         
Ending AOCI balance – December 31, 2018
   $
(1,069
)
   $
259
     $
(810
)
   
Gains and
losses on cash
flow hedges
    
Tax impact
    
Total AOCI
  
                         
Opening AOCI balance – December 31, 2016
   $
156
     $
(56
)
   $
100
  
                         
Other comprehensive income (loss) before reclassifications
    
863
      
(313
)
    
550
  
Amount reclassified from accumulated other comprehensive income
    
(1,019
)
    
369
      
(650
)
Other comprehensive income (loss) for the year ended December 31, 2017
    
(156
)
    
56
 
    
(100
)
                         
Ending AOCI balance – December 31, 2017
   $
—
     $
—
     $
—
  
   
Gains and
losses on cash
flow hedges
    
Tax impact
    
Total AOCI
  
                         
Opening AOCI balance – December 31, 2015
   $
(1,721
)
   $
612
     $
(1,109
)
                         
Other comprehensive income (loss) before reclassifications
    
872
      
(304
)
    
568
  
Amount reclassified from accumulated other comprehensive income
    
1,005
      
(364
)
    
641
  
Other comprehensive income (loss) for the year ended December 31, 2016
    
1,877
      
(668
)
    
1,209
  
                         
Ending AOCI balance – December 31, 2016
   $
156
     $
(56
)
   $
100
  
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
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
  
                             
Foreign currency forward contracts – year ended December 31, 2018
    
 
  
Operating expenses
   $
(245
)
 
    
 
  
    $
(810
)
Cost of revenues
   $
(36
)
Operating expenses
   $
—
  
                             
     
 
  
Operating expenses
   $
879
  
 
    
 
  
Foreign currency forward contracts – year ended December 31, 2017
   $
(100
)
Cost of revenues
   $
140
  
Operating expenses
   $
—
  
                             
     
 
  
Operating expenses
   $
(737
)
 
    
 
  
Foreign currency forward contracts – year ended December 31, 2016
   $
1,209
  
Cost of revenues
   $
(221
)
Operating expenses
   $
(47
)