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Note 6 - Derivative Instruments and Hedging Activities (Tables)
 6 Months Ended
Jun. 30, 2019
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 2019
   $
9,881
     $
1.3136
     $
48
  
October - December 2019
    
10,327
      
1.3174
      
92
  
    $
20,208
     $
1.3156
     $
140
  
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 June 30,
2019
Fair Value
Asset
   
As of December 31,
2018
Fair Value
Liability
  
Foreign Currency forward contracts designated as cash flow hedges (net)
Derivative instruments
   $
158
     $
(1,069
 )
Foreign Currency forward contracts not designated as cash flow hedges (net)
Derivative instruments
    
(18
 )    
(207
 )
Total foreign currency forward contracts (net)
Derivative instruments
   $
140
     $
(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 - March 31, 2019
   $
(264
 )   $
64
     $
(200
 )
Other comprehensive income (loss) before reclassifications
    
317
      
(77
 )    
240
  
Amount reclassified from AOCI
    
106
      
(26
 )    
80
  
Other comprehensive income (loss) for the three months ended June 30, 2019
    
423
      
(103
 )    
320
  
                         
Ending AOCI Balance - June 30, 2019
   $
159
     $
(39
 )   $
120
  
   
Gains and losses on
cash flow hedges
    
Tax impact
    
Total AOCI
  
Opening AOCI balance - December 31, 2018
   $
(1,069
 )   $
259
     $
(810
 )
Other comprehensive income (loss) before reclassifications
    
1,042
      
(253
 )    
789
  
Amount reclassified from AOCI
    
186
      
(45
 )    
141
  
Other comprehensive income (loss) for the six months ended June 30, 2019
    
1,228
      
(298
 )    
930
  
                         
Ending AOCI Balance - June 30, 2019
   $
159
     $
(39
 )   $
120
  
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
(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
   $
(91
 )   $
-
     $
-
  
Foreign currency forward contracts for the three months ended June 30, 2019
   $
320
  
Cost of revenues
   $
(15
 )   $
-
     $
-
  
                                   
     
 
  
Operating expenses
   $
(1
 )   $
-
     $
-
  
Foreign currency forward contracts for the three months ended June 30, 2018
   $
(260
 )
Cost of revenues
   $
(16
 )   $
-
     $
-
  
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
(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
   $
(154
 )   $
-
     $
-
  
Foreign currency forward contracts for the six months ended June 30, 2019
   $
930
  
Cost of revenues
   $
(32
 )   $
-
     $
-
  
                                   
     
 
  
Operating expenses
   $
(1
 )   $
-
     $
-
  
Foreign currency forward contracts for the six months ended June 30, 2018
   $
(243
 )
Cost of revenues
   $
(16
 )   $
-
     $
-