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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