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Note 1 - Basis of Presentation and General Information (Tables)
12 Months Ended
Dec. 31, 2014
Disclosure Text Block [Abstract]  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
   
Year ended December 31,
 
Charterer
 
2012
   
2013
   
2014
 
A
                13 %
B
    12 %     11 %