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Note 10 - Long-Term Debt (Details) - Summary of Long Tem Debt (USD $)
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Bank loans $ 45,644,000 $ 61,581,000
Less: Current portion (12,862,000) (15,937,000)
Long-term portion 32,782,000 45,644,000
Prospero Maritime Inc. Borrower [Member]
   
Debt Instrument [Line Items]    
Bank loans   4,675,000
Xingang Shipping Ltd. / Alcinoe Shipping Ltd Borrower [Member]
   
Debt Instrument [Line Items]    
Bank loans 5,000,000 6,000,000
Manolis Shipping Ltd. Borrower [Member]
   
Debt Instrument [Line Items]    
Bank loans 5,840,000 6,480,000
Trust Navigation Corp. / Tiger Navigation Co. Borrower [Member]
   
Debt Instrument [Line Items]    
Bank loans   2,000,000
Saf-Concord Shipping Ltd. Borrower [Member]
   
Debt Instrument [Line Items]    
Bank loans 5,250,000 6,250,000
Eleni Shipping Ltd. Borrower [Member]
   
Debt Instrument [Line Items]    
Bank loans 5,400,000 7,000,000
Pantelis Shipping Corp. Borrower [Member]
   
Debt Instrument [Line Items]    
Bank loans 7,360,000 8,480,000
Aggeliki Shipping Ltd. Borrower [Member]
   
Debt Instrument [Line Items]    
Bank loans 4,864,000 6,076,000
Noumea Shipping Ltd. Borrower [Member]
   
Debt Instrument [Line Items]    
Bank loans $ 11,930,000 $ 14,620,000