Note 12 - Properties and Equipment, Accrued Expenses, Other Current Liabilities and Other Liabilities - Accrued Cost and Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Payroll and related payables	$ 16,852	$ 17,201
Accrued vessel expenses	20,106	17,129
Accrued interest expense	2,596	3,240
Other accrued expenses	12,579	14,852
Accrued Liabilities, Current, Total	$ 52,133	$ 52,422