Note 15 - Financial Derivatives - Not Designated as Hedging (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Spot, Forward, and Swap Contracts with Positive Fair Value [Member]
Notional	$ 154,340	$ 151,244
Option contracts, fair value	2,891	4,658
Spot, Forward, and Swap Contracts with Negative Fair Value [Member]
Notional	96,119	132,813
Option contracts, fair value	$ (2,550)	$ (2,200)