Note 2 - Summary of Significant Accounting Policies - Property and Equipment, Net (Details) |
12 Months Ended |
---|---|
Dec. 31, 2022 | |
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] | |
Property, Plant and Equipment, Useful Life (Year) | 5 years |