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Note 5 - Derivative Instruments and Hedging Activities (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Derivative Instruments [Table Text Block]
Maturity date
 
Notional
amount of U.S.
dollars
   
Weighted
average
exchange rate of
U.S. dollars
   
Fair value
 
                         
July - September 2017
   
6,928,942
      
1.3494
      
289,005
  
October - December 2017
   
6,859,570
      
1.3478
      
284,373
  
    $
13,788,512
      
1.3486
     $
573,378
  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
       
As of
June 30
, 2017
    
As of
December
31,
2016
  
Derivatives
  
Balance Sheet
Location
  
Fair Value
Asset
(Liability)
    
Fair Value
Asset
(Liability)
  
                     
Foreign currency forward contracts designated as cash flow hedges
  
Derivative instruments
   $
517,894
     $
155,560
  
                     
Foreign currency forward contracts not designated as cash flow hedges
  
Derivative instruments
   $
55,484
     $
17,823
  
                     
Total foreign currency forward contracts
  
Derivative instruments
   $
573,378
     $
172,888
  
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, 2017
   $
321,248
     $
(116,485
)
   $
204,763
  
                         
Other comprehensive income (loss) before reclassifications
    
223,983
      
(81,215
 )    
142,768
  
Amount reclassified from accumulated other comprehensive income
    
(27,337
)
    
9,912
      
(17,425
 )
Other comprehensive income (loss) for the
three months ended June 30, 2017
    
196,646
      
(71,303
)
    
125,343
  
                         
Ending AOCI balance
– June 30, 2017
   $
517,894
     $
(187,788
)
   $
330,106
  
   
Gains and
losses on cash
flow hedges
    
Tax impact
    
Total AOCI
  
Opening AOCI balance
– December 31, 2016
   $
155,560
     $
(56,406
)
   $
99,154
  
                         
Other comprehensive income (loss) before reclassifications
    
516,154
      
(187,157
 )    
328,997
  
Amount reclassified from accumulated other comprehensive income
    
(153,820
)
    
55,775
      
(98,045
 )
Other comprehensive income (loss) for the six
months ended June 30, 2017
    
362,334
      
(131,382
)
    
230,952
  
                         
Ending AOCI balance
– June 30, 2017
   $
517,894
     $
(187,788
)
   $
330,106
  
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
Testing)
  
                             
     
 
  
Operating
expenses
   $
23,595
  
Operating
expenses
   $
—
  
Foreign currency forward contracts for the three months ended June 30, 2017
   $
125,343
  
Cost of
revenues
   $
3,742
  
Cost of
revenues
    
—
  
                             
                             
     
 
  
Operating
expenses
   $
(88,441
)
Operating
expenses
   $
—
  
Foreign currency forward contracts for the three months ended June 30, 2016
   $
106,631
  
Cost of
revenues
   $
(36,075
)
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
   $
128,950
  
Operating
expenses
   $
—
  
Foreign currency forward contracts for the
six months ended June 30, 2017
   $
230,952
  
Cost of
revenues
   $
24,870
  
Cost of
revenues
    
—
  
                             
                             
     
 
  
Operating
expenses
   $
(460,830
)
Operating
expenses
   $
(47,242
)
Foreign currency forward contracts for the
six months ended June 30, 2016
   $
990,151
  
Cost of
revenues
   $
(142,891
)
Cost of
revenues
    
—