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Note 5 - Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments in the Consolidated Balance Sheets (Details) - Derivative Instruments [Member] - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Foreign currency forward contracts $ 559,663 $ 172,888
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]    
Foreign currency forward contracts 505,232 155,560
Not Designated as Hedging Instrument [Member]    
Foreign currency forward contracts $ 54,431 $ 17,823