Note 4 - Fair Value of Financial Instruments - Amounts of Gain (Loss) Recognized in Condensed Consolidated Statements on Derivative Instruments Not Designated as Hedges (Details) - Foreign Currency Gain (Loss) [Member] - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Currency Forward Contracts [Member]
Amount of gain (loss) recognized	[1]	$ 424	$ 941	$ 2,949	$ 2,640
Cross Currency Interest Rate Contract [Member]
Amount of gain (loss) recognized	[2]	$ 758	$ 0	$ 758	$ 0

[1] The foregoing currency forward transactions were not designated as hedge transactions and are marked to market with the corresponding gains or losses recognized within "Derivatives and foreign currency transaction gains (losses)".

[2] The foregoing cross currency swap transactions were designated as a cash flow hedge as further described under note 1 to the condensed consolidated financial statements. The changes in the CCS fair value are initially recorded in "Other comprehensive income (loss)" and a corresponding amount is reclassified out of "Accumulated other comprehensive income (loss)" to "Derivatives and foreign currency transaction gains (losses)" to offset the remeasurement of the underlying hedged transaction which also impacts the same line item in the condensed consolidated statements of operations and comprehensive income.