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Note 5 - Transactions with Related Parties (Details) - The Fees Charged by Central Mare (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Related Party Transaction [Line Items]          
Fees charged by Central Mare $ 63 $ 465 $ 3,521 $ 4,998 $ 13,901
Management Fee [Member]
         
Related Party Transaction [Line Items]          
Fees charged by Central Mare 33 158 505 2,345 5,575
Executive Officers and Other Personnel Expenses [Member]
         
Related Party Transaction [Line Items]          
Fees charged by Central Mare 30 240 1,760 2,349 5,405
Commissions on Charter Hire Agreements [Member]
         
Related Party Transaction [Line Items]          
Fees charged by Central Mare   $ 67 $ 150 $ 275 $ 1,216