Note 19 - Supplemental Cash Flow Information - Cash Paid for Interest and Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest (net of amounts capitalized)	$ 62,997	$ 73,574	$ 92,926
Income taxes	$ 1,476	$ 40,139	$ 12,834