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Note 16 - Derivative Financial Instruments (Detail) - Gain or Loss on Derivatives Not Designated as Hedging Instruments (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Total loss on derivatives $ (637,403) $ (1,498,122) $ (4,221,817)
FFA Contract (Member)
     
FFA contracts – Fair value   (574,336) 9,692,455
FFA contracts - Realized loss (2,247) 910,088 (10,875,776)
Interest Rate Swap [Member]
     
Interest rate – Fair value 1,057,928 (76,516) (1,468,650)
Interest rate contracts - Realized loss $ (1,693,084) $ (1,758,158) $ (1,569,846)