Note 5 - Derivative Instruments and Hedging Activities - Foreign Currency Forward Contracts (Details) $ in Thousands	Sep. 30, 2021 USD ($)
Foreign Exchange Forward 1 [Member]
Notional amount of U.S. dollars	$ 12,959
Weighted average exchange rate of U.S. dollars	1.2455
Foreign currency forward contracts, asset	$ (209)
Foreign Exchange Forward 2 [Member]
Notional amount of U.S. dollars	$ 7,930
Weighted average exchange rate of U.S. dollars	1.2452
Foreign currency forward contracts, asset	$ (129)
Foreign Exchange Forward 3 [Member]
Notional amount of U.S. dollars	$ 20,889
Weighted average exchange rate of U.S. dollars	1.2454
Foreign currency forward contracts, asset	$ (338)