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Note 5 - Long-Term Debt (Details) - Summary of Long Term Debt (USD $)
Jun. 30, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Bank loans $ 59,438,000 $ 45,644,000
Less: Current portion (14,617,000) (12,862,000)
Long-term portion 44,821,000 32,782,000
Prospero Maritime Inc. Borrower [Member]
   
Debt Instrument [Line Items]    
Bank loans 1,906,250  
Allendale Investments S.A. [Member]
   
Debt Instrument [Line Items]    
Bank loans 1,906,250  
Eternity Shipping Company [Member]
   
Debt Instrument [Line Items]    
Bank loans 1,906,250  
Pillory Associates Corporation [Member]
   
Debt Instrument [Line Items]    
Bank loans 1,906,250  
Eirini Shipping Ltd. [Member]
   
Debt Instrument [Line Items]    
Bank loans 15,300,000  
Xingang Shipping Ltd. / Alcinoe Shipping Ltd Borrower [Member]
   
Debt Instrument [Line Items]    
Bank loans 4,600,000 5,000,000
Manolis Shipping Ltd. Borrower [Member]
   
Debt Instrument [Line Items]    
Bank loans 5,520,000 5,840,000
Saf-Concord Shipping Ltd. Borrower [Member]
   
Debt Instrument [Line Items]    
Bank loans 4,750,000 5,250,000
Eleni Shipping Ltd. Borrower [Member]
   
Debt Instrument [Line Items]    
Bank loans   5,400,000
Pantelis Shipping Corp. Borrower [Member]
   
Debt Instrument [Line Items]    
Bank loans 6,800,000 7,360,000
Aggeliki Shipping Ltd. Borrower [Member]
   
Debt Instrument [Line Items]    
Bank loans 4,258,000 4,864,000
Noumea Shipping Ltd. Borrower [Member]
   
Debt Instrument [Line Items]    
Bank loans $ 10,585,000 $ 11,930,000