Note 7 - Interest Expense, Net - Components of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Interest related to sale of tax benefits	$ 2,916	$ 1,607	$ 6,086	$ 5,468
Interest expense	16,571	13,299	45,298	41,620
Less — amount capitalized	(787)	(3,214)	(2,494)	(5,933)
Interest Expense, Total	$ 18,700	$ 11,692	$ 48,890	$ 41,155