Note 7 - Derivative Instruments and Hedging Activities - Foreign Currency Forward Contracts (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Notional amount of U.S. dollars	$ 30,486
Weighted average exchange rate of U.S. dollars	1.3296
Foreign currency forward contracts, asset	$ 731
Foreign Exchange Forward 1 [Member]
Notional amount of U.S. dollars	$ 10,729
Weighted average exchange rate of U.S. dollars	1.3296
Foreign currency forward contracts, asset	$ 259
Foreign Exchange Forward 2 [Member]
Notional amount of U.S. dollars	$ 9,654
Weighted average exchange rate of U.S. dollars	1.3296
Foreign currency forward contracts, asset	$ 232
Foreign Exchange Forward 3 [Member]
Notional amount of U.S. dollars	$ 5,300
Weighted average exchange rate of U.S. dollars	1.3296
Foreign currency forward contracts, asset	$ 127
Foreign Exchange Forward 4 [Member]
Notional amount of U.S. dollars	$ 4,803
Weighted average exchange rate of U.S. dollars	1.3296
Foreign currency forward contracts, asset	$ 113