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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, 2020
Dec. 31, 2019
Vessels and related equipment $ 940,175 $ 1,051,558
Other properties and equipment 16,861 13,119
Property, Plant and Equipment, Gross, Ending Balance 957,036 1,064,677
Less accumulated depreciation and amortization 176,718 125,716
Net properties and equipment $ 780,318 $ 938,961