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Note 4 - Derivative instrument assets/liabilities: (Tables)
 12 Months Ended
Dec. 31, 2012
Schedule of Derivative Instruments [Table Text Block]
   
Balance Sheet
 
Year ended
 December 31,
 2012
Fair Value
Asset
   
Year ended
December 31,
2011
Fair Value
Asset
 
Derivatives
Location
 
 (Liability)
   
 (Liability)
 
               
Foreign currency forward contracts designated as cash flow hedges
Derivative instruments
  $ 377,703     $ —  
                   
Foreign currency forward contracts not designated as cash flow hedges
Derivative instruments
  $ 67,079     $ (699,483 )
                   
Total foreign currency forward contracts
Derivative instruments
  $ 444,782     $ (699,483 )
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block]
Derivatives in Cash Flow
Hedging Relationship
 
Amount of Gain or (Loss) Recognized in OCI 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)
 
                               
Foreign currency forward contracts
  $ 44,104       —       —       —       —