Note 16 - Financial Derivatives - Not Designated as Hedging (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Foreign Exchange Forward [Member]
Notional	$ 2,496	$ 908
Option contracts, fair value	(14)	(7)
Spot, Forward, and Swap Contracts with Positive Fair Value [Member]
Notional	110,465	146,397
Option contracts, fair value	1,157	2,411
Spot, Forward, and Swap Contracts with Negative Fair Value [Member]
Notional	216,401	127,003
Option contracts, fair value	$ (4,211)	$ (1,415)