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Note 2 - Summary of Significant Accounting Policies - Property and Equipment, Net (Details)
Dec. 31, 2024
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
Building and Building Improvements [Member] | Minimum [Member]  
Property, Plant and Equipment, Useful Life (Year) 3 years
Building and Building Improvements [Member] | Maximum [Member]  
Property, Plant and Equipment, Useful Life (Year) 40 years
Furniture and Fixtures [Member]  
Property, Plant and Equipment, Useful Life (Year) 5 years