Note 17 - Interest Expense, Net - Components of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest related to sale of tax benefits									$ 11,284	$ 6,985	$ 9,349
Interest expense									63,368	54,381	61,327
Less — amount capitalized									(3,728)	(7,224)	(3,287)
	$ 22,034	$ 18,700	$ 15,846	$ 14,344	$ 12,987	$ 11,692	$ 14,540	$ 14,923	$ 70,924	$ 54,142	$ 67,389