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Note 7 - Derivative Instruments and Hedging Activities - Foreign Currency Forward Contracts (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Foreign Exchange Forward 1 [Member]  
Notional amount of U.S. dollars $ 9,955
Weighted average exchange rate of U.S. dollars 1.3131
Fair value $ 355
Foreign Exchange Forward 2 [Member]  
Notional amount of U.S. dollars $ 10,381
Weighted average exchange rate of U.S. dollars 1.3154
Fair value $ 332
Foreign Exchange Forward 3 [Member]  
Notional amount of U.S. dollars $ 9,881
Weighted average exchange rate of U.S. dollars 1.3136
Fair value $ 310
Foreign Exchange Forward 4 [Member]  
Notional amount of U.S. dollars $ 10,327
Weighted average exchange rate of U.S. dollars 1.3174
Fair value $ 279
Foreign Exchange Forward 5 [Member]  
Notional amount of U.S. dollars $ 40,544
Weighted average exchange rate of U.S. dollars 1.3149
Fair value $ 1,276