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Note 17 - Investment in Joint Venture (Detail) - Summarized Financial Information for the Joint Venture (USD $) | 12 Months Ended
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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)

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