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Note 4 - Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments in the Consolidated Balance Sheets (Details) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Derivative Instruments [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]    
Foreign currency forward contracts $ (72,498) $ (1,721,683)
Derivative Instruments [Member] | Not Designated as Hedging Instrument [Member]    
Foreign currency forward contracts (13,271) (305,403)
Derivative Instruments [Member]    
Foreign currency forward contracts (85,769) $ (2,027,086)
Foreign currency forward contracts $ (85,769)