Note 4 - Property and Equipment - Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property and equipment, gross	$ 765,341	$ 665,398
Less: Accumulated depreciation	(222,923)	(182,725)
Property and equipment, net	542,418	482,673
Vessels and Vessel Improvements [Member]
Property and equipment, gross	739,957	649,286
Furniture and Fixtures [Member]
Property and equipment, gross	23,958	14,687
Leasehold Improvements [Member]
Property and equipment, gross	$ 1,426	$ 1,425

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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