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Note 10 - Long-term Debt (Detail) - Long-term Debt (USD $)
 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Outstanding $ 353,269,983 $ 351,068,181
Additions 43,250,000  
Repayments (41,048,198)  
Current portion of long-term debt 35,162,544 33,166,887
Current portion of long-term debt associated with vessel held for sale   791,823
Long-term debt 318,107,439 317,109,471
BNP Paribas [Member]
    
Outstanding 23,500,000 27,297,823
Repayments (3,797,823)  
DuB Nor Bank [Member]
    
Outstanding 81,569,723 90,766,455
Repayments (9,196,732)  
Scotia Bank [Member]
    
Outstanding 32,722,764 34,600,514
Repayments (1,877,750)  
Deutche Bank [Member]
    
Outstanding 26,875,000 29,375,000
Repayments (2,500,000)  
National Bank of Greece [Member]
    
Outstanding 26,453,500 27,423,000
Repayments (969,500)  
Emporiki Bank [Member]
    
Outstanding 10,600,000 24,285,502
Repayments (13,685,502)  
DVB Bank [Member]
    
Outstanding 69,519,800 73,880,423
Repayments (4,360,623)  
NIBC [Member]
    
Outstanding 17,434,196 19,589,464
Repayments (2,155,268)  
EFG Eurobank [Member]
    
Outstanding 22,470,000 23,850,000
Repayments (1,380,000)  
NORD/LB [Member]
    
Outstanding 42,125,000  
Additions 43,250,000  
Repayments $ (1,125,000)