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Note 2 - Summary of Significant Accounting Policies - Property and Equipment, Net (Details)	Dec. 31, 2023
Vessels and Vessel Improvements [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	15 years
Vessels and Vessel Improvements [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	25 years
Furniture and Fixtures [Member]
Property, Plant and Equipment, Useful Life (Year)	5 years
Computer Hardware and Software [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	5 years
Computer Hardware and Software [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	10 years