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Note 5 - Derivative Instruments and Hedging Activities (Tables)
 9 Months Ended
Sep. 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
 
                         
October - December 2017
    
6,859,570
      
1.3478
      
559,663
  
    $
6,859,570
      
1.3478
     $
559,663
  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
       
As of
September
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
   $
505,232
     $
155,560
  
                     
Foreign currency forward contracts not designated as cash flow hedges
  
Derivative instruments
   $
54,431
     $
17,823
  
                     
Total foreign currency forward contracts
  
Derivative instruments
   $
559,663
     $
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
– June 30, 2017
   $
517,894
     $
(187,788
)
   $
330,106
  
                         
Other comprehensive income (loss) before reclassifications
    
485,480
      
(176,035
 )    
309,445
  
Amount reclassified from accumulated other comprehensive income
    
(498,142
)
    
180,626
      
(317,516
 )
Other comprehensive income (loss) for the
three months ended September 30, 2017
    
(12,662
)
    
4,591
      
(8,071
)
                         
Ending AOCI balance
– September 30, 2017
   $
505,232
     $
(183,197
)
   $
322,035
  
   
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
    
1,001,634
      
(363,192
 )    
638,442
  
Amount reclassified from accumulated other comprehensive income
    
(651,962
)
    
236,401
      
(415,561
 )
Other comprehensive income (loss) for the
nine months ended September 30, 2017
    
349,672
      
(126,791
)
    
222,881
  
                         
Ending AOCI balance
– September 30, 2017
   $
505,232
     $
(183,197
)
   $
322,035
  
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
   $
432,021
  
Operating expenses
   $
—
  
Foreign currency forward contracts for the three months ended
September 30, 2017
   $
(8,071
 )
Cost of revenues
   $
66,121
  
Cost of revenues
    
—
  
                             
     
 
  
Operating expenses
   $
(156,743
)
Operating expenses
   $
—
  
Foreign currency forward contracts for the three months ended
September 30, 2016
   $
73,091
  
Cost of revenues
   $
(50,210
)
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
   $
560,971
  
Operating expenses
   $
—
  
Foreign currency forward contracts for the
nine months ended September 30, 2017
   $
222,881
  
Cost of revenues
   $
90,991
  
Cost of revenues
    
—
  
                             
     
 
  
Operating expenses
   $
(617,572
)
Operating expenses
   $
(47,242
)
Foreign currency forward contracts for the
nine months ended September 30, 2016
   $
1,063,242
  
Cost of revenues
   $
(193,102
)
Cost of revenues
    
—