Note 6 - Financial Instruments and Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Gain (Loss) from Components Excluded from Assessment of Cash Flow Hedge Effectiveness, Net, Total	$ 0
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	5,800
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	(13,399)	$ (1,638)
AOCI Attributable to Parent [Member] | Foreign Exchange Forward [Member]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	$ (3,400)	$ 700