Note 12 - Properties and Equipment, Accrued Costs and Expenses, Other Current Liabilities and Other Liabilities - Summary of Accrued Costs and Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Payroll and related payables	$ 16,364	$ 16,351
Accrued vessel expenses	17,968	38,383
Accrued interest expense	4,053	4,570
Other accrued expenses	17,426	14,696
Accrued Liabilities, Current, Total	$ 55,811	$ 74,000