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Note 2 - Significant Accounting Policies (Details Textual)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Estimated Salvage Value Per Light Weight Ton of Vessel 0.25 0.25
Ship Owning Crew Contract Term (Day) 9 days  
Number of Reportable Segments 1  
Vessels [Member]    
Property, Plant and Equipment, Useful Life (Year) 25 years