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Note 1 - Basis of Presentation and General Information (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
    Year ended December 31,
Charterer   2017   2018   2019
CMA CGM, Marseille    
34
%    
51
%    
24
%
New Golden Sea Shipping Pte. Ltd., Singapore    
31
%    
33
%    
21
%
Hapag-Lloyd AG, Hamburg    
-
     
-
     
16
%
MSC Geneva    
17
%    
11
%    
15
%
Maersk Line A/S    
-
     
-
     
11
%