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Note 1 - Basis of Presentation and General Information (Tables)
12 Months Ended
Dec. 31, 2012
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
 
                                       Year ended December 31,
Charterer
                      2010
                      2011
                      2012
       
Maersk Lines
14.95%
15.73%
11.75%
Klaveness
30.29%
13.59%
10.71%
Sun Express
10.10%
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