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Note 4 - Derivative Instruments and Hedging Activities (Tables)
 3 Months Ended
Mar. 31, 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
 
                                   
April
-
June
2017
        $
6,461,047
      
1.3512
     $
113,277
  
July
-
September
2017
         
6,928,942
      
1.3494
      
121,356
  
October
-
December
2017
         
6,859,570
      
1.3478
      
121,892
  
 
 
 
         $
20,249,559
      
1.3494
     $
356,525
  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
       
As of
March 31, 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
   $
321,248
     $
155,560
  
                     
Foreign currency forward contracts not designated as cash flow hedges
  
Derivative instruments
   $
35,277
     $
17,328
  
                     
Total foreign currency forward contracts
  
Derivative instruments
   $
356,525
     $
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
– December 31, 2016
   $
155,560
     $
(56,406
)
   $
99,154
  
                         
Other comprehensive income (loss) before reclassifications
    
292,171
      
(105,942
 )    
186,229
  
Amount reclassified from accumulated other comprehensive income
    
(126,483
)
    
45,863
      
(80,620
 )
Other comprehensive income (loss) for the three months ended
March 31, 2017
    
165,688
      
(60,079
)
    
105,609
  
                         
Ending AOCI balance
– March 31, 2017
   $
321,248
     $
(116,485
)
   $
204,763
  
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
   $
105,355
  
Operating expenses
   $
—
  
Foreign currency forward contracts for the three months ended
March 31, 2017
   $
105,609
  
Cost of revenues
   $
21,128
  
Cost of revenues
    
—
  
                             
     
 
  
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
    
—