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Note 4 - Derivative Instruments and hedging activities (Details) - Fair value of derivative instruments in the consolidated balance sheets (Derivative Instruments [Member], USD $)
Sep. 30, 2013
Dec. 31, 2012
Derivative Instruments [Member]
   
Derivatives, Fair Value [Line Items]    
Foreign currency forward contracts designated as cash flow hedges $ 139,487 $ 377,703
Foreign currency forward contracts not designated as cash flow hedges 16,057 67,079
Total foreign currency forward contracts $ 155,544 $ 444,782