Note 1 - Nature of Operations and Summary of Significant Accounting Policies - Property Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Vessels and related equipment	$ 1,716,339	$ 1,070,821
Other properties and equipment	32,447	35,819
Property, Plant and Equipment, Gross	1,748,786	1,106,640
Less accumulated depreciation and amortization	433,664	309,985
Net properties and equipment	$ 1,315,122	$ 796,655