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Note 7 - Derivative Instruments and Hedging Activities (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Derivatives
Balance Sheet
Location
  
December 31,
201
6

Assets at
Fair Value
    
December 31,
201
5

Liabilities at
Fair Value
  
                   
Foreign currency forward contracts designated as cash flow hedges
Derivative instruments
   $
155,560
     $
(1,721,683
)
                   
Foreign currency forward contracts not designated as cash flow hedges
Derivative instruments
   $
17,328
     $
(305,403
)
                   
Total foreign currency forward contracts
Derivative instruments
   $
172,888
     $
(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
    
871,925
      
(304,109
)
    
567,816
  
Amount reclassified from accumulated other comprehensive income
    
1,005,318
      
(364,528
)
    
640,790
  
Other comprehensive income (loss) for the year ended December 31,
2016
    
1,877,243
      
(668,637
)
    
1,208,606
  
                         
Ending AOCI balance
– December 31, 2016
   $
155,560
     $
(56,406
)
   $
99,154
  
   
Gains and
losses on cash
flow hedges
    
Tax impact
    
Total AOCI
  
                         
Opening AOCI balance
– December 31, 2014
   $
(946,676
)
   $
324,235
     $
(622,441
)
                         
Other comprehensive income (loss) before reclassifications
    
(3,171,740
)
    
1,140,275
      
(2,031,465
)
Amount reclassified from accumulated other comprehensive income
    
2,396,733
      
(852,279
)
    
1,544,454
  
Other comprehensive income (loss) for the year ended December 31, 2015
    
(775,007
)
    
287,996
      
(487,011
)
                         
Ending AOCI balance
– December 31, 2015
   $
(1,721,683
)
   $
612,231
     $
(1,109,452
)
   
Gains and
losses on cash
flow hedge
s
    
Tax impac
t
    
Total AOC
I
  
                         
Opening AOCI balance –
 December 31, 2013
   $
(372,593
 )   $
127,612
     $
(244,981
 )
                         
Other comprehensive income (loss) before reclassification
s
    
(1,527,171
 )    
523,056
      
(1,004,115
 )
Amount reclassified from accumulated other comprehensive incom
e
    
953,088
      
(326,433
 )    
626,655
  
Other
comprehensive income (loss) for the year ended December 31, 2014
    
(574,083
 )    
196,623
      
(377,460
 )
                         
Ending AOCI balance 
– December 31, 2014
   $
(946,676
 )   $
324,235
     $
(622,441
 )
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
  
                             
     
 
  
Operating expenses
   $
(736,616
)
 
    
 
  
Foreign currency forward contracts
– year ended December 31, 2016
   $
1,208,606
  
Cost of revenues
   $
(221,460
)
Operating expenses
   $
(47,242
)
                             
     
 
  
Operating expenses
   $
(1,870,818
)
 
    
 
  
Foreign currency forward contracts
– year ended December 31, 2015
   $
(487,011
)
Cost of revenues
   $
(525,916
)
Operating expenses
   $
(294,113
)
                             
     
 
  
Operating expense
s
   $
(704,42
7
 )
 
    
 
  
Foreign currency forward contracts 
– year ended December 31, 2014
   $
(377,46
0
 )
Cost of revenue
s
   $
(248,66
2
 )
Operating expenses
 
   $
(20,53
5
 )