Note 23 - Segment Information - Revenue and Other Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Total Segment Revenue and Freight from External Customers	$ 879,462	$ 1,375,559	$ 1,472,790
Other Income not Allocated to Segments (Note 4)	126,886	53,349	58,660
Gain on Sale of Assets	15,295	1,995	565
Total Consolidated Revenue and Other Income	$ 1,021,643	$ 1,430,903	$ 1,532,015