Note 4 - Property and Equipment, Net - Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Property and equipment, gross	$ 863,373	$ 820,101
Less: Accumulated depreciation	(344,983)	(294,099)
Property and equipment, net	518,390	526,002
Vessels and Vessel Improvements [Member]
Property and equipment, gross	799,652	776,622
Furniture and Fixtures [Member]
Property and equipment, gross	59,132	42,055
Land [Member]
Property and equipment, gross	729	0
Building and Building Improvements [Member]
Property and equipment, gross	2,435	0
Leasehold Improvements [Member]
Property and equipment, gross	$ 1,425	$ 1,424