Note 14 - Accrued Charter Revenue, Current and Non-current, Unearned Revenue, Current and Non-current and Time Charter Assumed, Current and Non-current - Schedule of Unearned Revenue (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Unearned Revenue	$ 79,529	$ 59,767
Less current portion	(52,177)	(25,227)
Non-current portion	27,352	34,540
Unearned Revenues Regarding Hires Collected in Advance [Member]
Unearned Revenue	34,258	16,906
Unearned Revenues Regarding Charter Revenues Resulting from Varying Charter Rates [Member]
Unearned Revenue	44,331	42,861
Unamortized Balance of Charters Assumed [Member]
Unearned Revenue	$ 940	$ 0