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Note 1 - Basis of Presentation and General Information (Tables)
12 Months Ended
Dec. 31, 2012
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
   
Year ended December 31,
 
Charterer
 
2010
   
2011
   
2012
 
A
    10 %            
B
    12 %     14 %     12 %
C
    11 %            
D
    10 %