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Note 1 - Nature of Operations and Summary of Significant Accounting Policies - Property Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Vessels and related equipment	$ 898,649	$ 940,175
Other properties and equipment	19,625	16,861
Property, Plant and Equipment, Gross, Ending Balance	918,274	957,036
Less accumulated depreciation and amortization	230,234	176,718
Net properties and equipment	$ 688,040	$ 780,318

X

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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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