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Note 8 - Debt (Details)
 3 Months Ended 12 Months Ended 12 Months Ended
Mar. 31, 2013
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2012
EUR (€)
Dec. 31, 2012
Chief Executive Officer [Member]
Shipping Financial Services Inc Credit Facility [Member]
USD ($)
Dec. 31, 2012
Chief Executive Officer [Member]
Shipping Financial Services Inc Credit Facility [Member]
EUR (€)
Dec. 31, 2012
Chief Executive Officer [Member]
Central Mare Inc Credit Facility [Member]
EUR (€)
Dec. 31, 2012
Chief Executive Officer [Member]
Central Mare [Member]
USD ($)
Dec. 31, 2012
Jeke [Member]
HSH Facility [Member]
USD ($)
Dec. 31, 2012
Warhol [Member]
HSH Facility [Member]
USD ($)
Dec. 31, 2012
Indiana [Member]
HSH Facility [Member]
USD ($)
Dec. 31, 2012
Britto [Member]
HSH Facility [Member]
USD ($)
Dec. 31, 2012
Lichtenstein [Member]
ALPHA [Member]
USD ($)
Dec. 31, 2013
M/T Delos Termination Fee [Member]
EUR (€)
Dec. 31, 2012
Tranche A-Banksy [Member]
DVB Facility [Member]
USD ($)
Dec. 31, 2012
Tranche A-Hongbo [Member]
DVB Facility [Member]
USD ($)
Dec. 31, 2012
Tranche B [Member]
DVB Facility [Member]
USD ($)
Dec. 31, 2012
HSH Facility [Member]
USD ($)
Dec. 31, 2012
DVB Facility [Member]
USD ($)
Dec. 31, 2012
Laurasia Trading Ltd Credit Facility [Member]
USD ($)
Note 8 - Debt (Details) [Line Items]                                            
Line of Credit Facility, Amount Outstanding   $ 0     $ 0   $ 462,000 € 350,000 € 1,800,000 $ 2,375,000                       $ 3,250,000
Interest Expense, Debt 1,521,000 4,644,000 7,240,000 10,068,000                       139,000            
Long-term Debt, Gross     461,000     350,000         15,768,000 29,712,000 21,527,000 26,658,000 27,000,000   20,000,000 24,727,000 3,520,000 93,664,000 48,247,000  
Unamortized Debt Issuance Expense                     106,000 256,000 303,000 265,000 181,000   408,000 438,000   929,000 846,000  
Number of Credit Facilities                                         1  
Increase (Decrease) in Deferred Charges   724,000 1,128,000                                      
Debt, Weighted Average Interest Rate   3.70% 3.55%                                      
Restricted Net Assets   $ 0 $ 15,806,000