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Note 11 - Common Stock, Additional Paid-In Capital and Warrants (Tables)
 6 Months Ended
Jun. 30, 2014
Note 11 - Common Stock, Additional Paid-In Capital and Warrants (Tables) [Line Items]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Six months ended June 30,
 
   
2013
   
2014
 
Income:
           
Net income
  $ 4,486     $
(415
)
                 
Basic Earnings per share:
               
Weighted average common shares outstanding, basic
    2,432,907       6,867,971  
Weighted average common shares outstanding, diluted     2,433,978       6,867,971  
Basic and diluted Earnings / (loss) per share
  $ 1.84     $
(0.06
)
Common Shares Outstanding [Member]
  
Note 11 - Common Stock, Additional Paid-In Capital and Warrants (Tables) [Line Items]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Six months ended
June 30,
 
   
2013
   
2014
 
Earnings / (loss) per share, basic and diluted before reverse stock split
  $ 0.26     $ (0.01 ) 
Reverse stock split impact on Earnings / (loss) per share, basic and diluted
  $ 1.58     $
(0.05
)
Earnings / (loss) per share, basic and diluted after reverse stock split
  $ 1.84     $
(0.06
)