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Note 5 - Derivative Instruments and Hedging Activities (Tables)
 3 Months Ended
Mar. 31, 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
 
                         
April
 - June 2016   $ 6,002,500       1.2556     $ (192,223 )
July
 - September 2016     6,002,500       1.2554       (192,596 )
October
 - December 2016     4,952,500       1.2885       (32,002 )
    $ 16,957,500       1.2651     $ (416,821 )
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
 
  
 
 
As of
March 31,
2016
 
 
As of
December 31,
2015
 
Derivatives
  
Balance Sheet
Location
 
Fair Value
Asset
(Liability)
 
 
Fair Value
Asset
(Liability)
 
                     
Foreign currency forward contracts designated as cash flow hedges
 
Derivative instruments
   $ (354,459
)
   $ (1,721,683
)
                     
Foreign currency forward contracts not designated as cash flow hedges
 
Derivative instruments
   $ (62,362
)
   $ (305,403
)
                     
Total foreign currency forward contracts
 
Derivative instruments
   $ (416,821
)
   $ (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 – December 31, 2015
   $ (1,721,683
)
   $ 612,231     $ (1,109,452
)
                         
Other comprehensive income (loss) before reclassifications
     840,777       (292,814
)
     547,963  
Amount reclassified from accumulated other comprehensive income
     526,447       (190,890
)
     335,557  
Other comprehensive income (loss) for the three months ended March 31, 2016
     1,367,224       (483,704
)
     883,520  
                         
Ending AOCI balance – March 31, 2016
   $ (354,459
)
   $ 128,527     $ (225,932
)
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
   $ (372,390
)
Operating expenses
   $  (47,240
)
Foreign currency forward contracts for the three months ended March 31, 2016
   $ 883,520  
Cost of revenues
     (106,817
)
Cost of
revenues
     —  
                             
                             
         
Operating expenses
   $ (468,016
)
Operating expenses
   $  (23,928
)
Foreign currency forward contracts for the three months ended March 31, 2015
   $ (544,792
)
Cost of revenues
     (177,660
)
Cost of
revenues
     —