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Note 4 - Derivative Instruments and Hedging Activities (Tables)
 6 Months Ended
Jun. 30, 2016
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 2016
    6,002,500       1.2554       (190,264
)
October -
December 2016
    4,952,500       1.2885       (30,289
)
        $ 10,955,000       1.2703     $ (220,553
)
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Derivatives
  
Balance Sheet
Location
 
As of
June 30
,
2016
Fair Value
Asset
(Liability)
 
 
As of
December 31,
2015
Fair Value
Asset
(Liability)
 
                     
Foreign currency forward contracts designated as cash flow hedges
 
Derivative instruments
   $ (187,169
)
   $ (1,721,683
)
                     
Foreign currency forward contracts not designated as cash flow hedges
 
Derivative instruments
   $ (33,384
)
   $ (305,403
)
                     
Total foreign currency forward contracts
 
Derivative instruments
   $ (220,553
)
   $ (2,027,086
)
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, 2016
   $ (354,459
)
   $ 128,527     $ (225,932
)
                         
Other comprehensive income (loss) before reclassifications
     42,774       (15,510
)
     27,264  
Amount reclassified from accumulated other comprehensive income
     124,516       (45,149
)
     79,367  
Other comprehensive income (loss) for the three months ended June 30, 2016
     167,290       (60,659
)
     106,631  
                         
Ending AOCI balance – June 30, 2016
   $ (187,169
)
   $ 67,868     $ (119,301
)
   
Gains and
losses on cash
flow hedges
    
Tax impact
    
Total AOCI
  
Opening AOCI balance – December 31, 2015
   $ (1,721,683
)
   $ 612,231     $ (1,109,452
)
                         
Other comprehensive income (loss) before reclassifications
     883,551       (308,324
)
     575,227  
Amount reclassified from accumulated other comprehensive income
     650,963       (236,039
)
     414,924  
Other comprehensive income (loss) for the six months ended June 30, 2016
     1,534,514       (544,363
)
     990,151  
                         
Ending AOCI balance – June 30, 2016
   $ (187,169
)
   $ 67,868     $ (119,301
)
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
   $ (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
     —  
                             
                             
         
Operating expenses
   $ (418,444
)
Operating expenses
   $ (8,741
)
Foreign currency forward contracts for the three months ended June 30, 2015
   $ 333,909  
Cost of revenues
     (158,768
)
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
   $ (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
     —  
                             
                             
         
Operating expenses
   $ (886,461
)
Operating expenses
   $ (31,323
)
Foreign currency forward contracts for the six months ended June 30, 2015
   $ (210,883
)
Cost of revenues
     (336,428
)
Cost of revenues
     —