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Note 5 - Derivative Instruments and Hedging Activities - Foreign Currency Forward Contracts (Details)
Jun. 30, 2017
USD ($)
Foreign Exchange Forward 1 [Member]  
Notional amount of U.S. dollars $ 6,928,942
Weighted average exchange rate of U.S. dollars 1.3494
Fair value $ 289,005
Foreign Exchange Forward 2 [Member]  
Notional amount of U.S. dollars $ 6,859,570
Weighted average exchange rate of U.S. dollars 1.3478
Fair value $ 284,373
Foreign Exchange Forward 3 [Member]  
Notional amount of U.S. dollars $ 13,788,512
Weighted average exchange rate of U.S. dollars 1.3486
Fair value $ 573,378