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