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Note 7 - Fair Value of Time Charters Acquired (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Maersk Noumea [Member]
Dec. 31, 2010
Maersk Noumea [Member]
Dec. 31, 2008
Maersk Noumea [Member]
Dec. 31, 2008
Charter One [Member]
Dec. 31, 2008
Charter Two [Member]
Dec. 31, 2008
Charter Three [Member]
Charter Rate Per Day           $ 16,800 $ 18,735 $ 19,240 $ 19,750
Present Value Of Below Market Acquired Time Charter           9,597,438      
54,921,697 64,129,511 54,422,489 1,318,211 2,106,416        
Unamortized Below Market Rate Charter $ 0     $ 0