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Note 9 - Long-Term Debt (Detail) - Summary of Long Tem Debt (USD $)
Dec. 31, 2012
Dec. 31, 2011
Bank loans $ 61,581,000 $ 74,913,000
Less: Current portion (15,937,000) (13,332,000)
Long-term portion 45,644,000 61,581,000
Xenia International Corp Borrower [Member]
   
Bank loans   2,420,000
Prospero Maritime Inc. Borrower [Member]
   
Bank loans 4,675,000 6,325,000
Xingang Shipping Ltd. / Alcinoe Shipping Ltd Borrower [Member]
   
Bank loans 6,000,000 7,000,000
Manolis Shipping Ltd. Borrower [Member]
   
Bank loans 6,480,000 7,120,000
Trust Navigation Corp. / Tiger Navigation Co. Borrower [Member]
   
Bank loans 2,000,000 2,200,000
Saf-Concord Shipping Ltd. Borrower [Member]
   
Bank loans 6,250,000 7,250,000
Eleni Shipping Ltd. Borrower [Member]
   
Bank loans 7,000,000 8,400,000
Pantelis Shipping Corp. Borrower [Member]
   
Bank loans 8,480,000 9,600,000
Aggeliki Shipping Ltd. Borrower [Member]
   
Bank loans 6,076,000 7,288,000
Noumea Shipping Ltd. Borrower [Member]
   
Bank loans $ 14,620,000 $ 17,310,000