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Note 4 - Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments in the Consolidated Balance Sheets (Details) - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Foreign currency forward contracts $ 356,525  
Derivative Instruments [Member]    
Foreign currency forward contracts 356,525  
Foreign currency forward contracts   $ 172,888
Derivative Instruments [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]    
Foreign currency forward contracts 321,248  
Foreign currency forward contracts   155,560
Derivative Instruments [Member] | Not Designated as Hedging Instrument [Member]    
Foreign currency forward contracts $ 35,277  
Foreign currency forward contracts   $ 17,328