Note 11 - Derivative Instruments - Fair Value of Forward and Put Option Contracts (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Other current assets, liability position	$ (11,737)	$ (6,170)
Forward and Put Option Contracts [Member] | Other Current Assets [Member]
Other current assets	200	0
Other current assets, liability position	(200)	0
Other current assets, net	0	0
Forward and Put Option Contracts [Member] | Other Noncurrent Assets [Member]
Other current assets, net	400	0
Other non-current assets	500	0
Other non-current assets, liability position	(100)	0
Forward and Put Option Contracts [Member] | Current derivatives liability [Member]
Other current assets	100	2,100
Other current assets, liability position	(11,800)	(7,900)
Other current assets, net	$ (11,700)	$ (5,800)