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Note 7 - Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments in the Consolidated Balance Sheets (Details) - Derivative Instruments [Member] - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Foreign currency forward contracts $ 172,888  
Foreign currency forward contracts   $ (2,027,086)
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]    
Foreign currency forward contracts 155,560  
Foreign currency forward contracts   (1,721,683)
Not Designated as Hedging Instrument [Member]    
Foreign currency forward contracts $ 17,328  
Foreign currency forward contracts   $ (305,403)