Note 6 - Financial Instruments and Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Gain (Loss) from Components Excluded from Assessment of Cash Flow Hedge Effectiveness, Net, Total			$ 0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	$ (2,535)	$ (0)	(2,650)	$ (5,326)
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months			(0)
Foreign Currency Transaction Gain (Loss), before Tax, Total	(1,434)	989	(1,165)	(6,334)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	(2,333)	1,745	(1,789)	(7,724)
Foreign Exchange Forward [Member] | AOCI Attributable to Parent [Member]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	(2,400)	1,700	(2,000)	(7,600)
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member]
Foreign Currency Transaction Gain (Loss), before Tax, Total	(900)	(5,300)	(1,000)	(5,300)
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]
Foreign Currency Transaction Gain (Loss), before Tax, Total	$ 300	$ 1,000	$ 200	$ (1,000)