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Note 17 - Investment in Joint Venture (Detail) - Summarized Financial Information for the Joint Venture (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Current assets $ 10,912,327 $ 7,732,697 $ 7,432,566
Long-term assets 242,007,329 217,878,004 167,386,946
Current liabilities 6,051,142 16,908,232 8,002,899
Long-term liabilities 127,316,330 107,737,239 65,834,481
Members’ contributions 132,000,000 105,750,000 105,750,000
Voyage revenue 27,428,223 29,233,585 4,479,908
Net revenue 26,216,805 28,107,669 4,367,197
Operating income / (loss) (2,018,854) 6,357,218 (3,388,490)
Net loss $ (8,413,047) $ (16,902) $ (4,017,868)