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Note 5 - Transactions with Related Parties (Details) - The Fees Charged by Related Parties (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Central Mare [Member] | Management Fee [Member]
    
Related Party Transaction [Line Items]    
Related Party Transactions $ 34 $ 302
Central Mare [Member] | Executive Officers and Other Personnel Expenses [Member]
    
Related Party Transaction [Line Items]    
Related Party Transactions 60 480
Central Mare [Member] | Commissions on Charter Hire Agreements [Member]
    
Related Party Transaction [Line Items]    
Related Party Transactions   127
Central Mare [Member]
    
Related Party Transaction [Line Items]    
Related Party Transactions 94 909
CMS [Member] | Management Fee [Member]
    
Related Party Transaction [Line Items]    
Related Party Transactions 9  
CMS [Member] | Commissions on Charter Hire Agreements [Member]
    
Related Party Transaction [Line Items]    
Related Party Transactions 2  
CMS [Member] | Technical Management Fees [Member]
    
Related Party Transaction [Line Items]    
Related Party Transactions 50  
CMS [Member] | Supervision Fee [Member]
    
Related Party Transaction [Line Items]    
Related Party Transactions 166  
CMS [Member] | Financing Fees [Member]
    
Related Party Transaction [Line Items]    
Related Party Transactions 40  
CMS [Member] | Commissions on Sale of Vessels [Member]
    
Related Party Transaction [Line Items]    
Related Party Transactions 383  
CMS [Member]
    
Related Party Transaction [Line Items]    
Related Party Transactions $ 650