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Note 18 - Investment in Joint Venture (Tables)
12 Months Ended
Dec. 31, 2013
Equity Method Investments and Joint Ventures [Abstract]  
Equity Method Investments [Table Text Block]
   
2011
   
2012
   
2013
 
                   
Current assets
    7,732,697       10,912,327      
11,207,156
 
Non current assets
    217,878,004       242,007,329      
268,669,048
 
Current liabilities
    16,908,232       6,051,142       2,829,682  
Non current liabilities
    107,737,239       127,316,330       128,600,421  
Members’ contributions
    105,750,000       132,000,000       175,750,000  
Voyage revenue
    29,233,585       27,428,223       27,510,792  
Net revenue
    28,107,669       26,216,805       26,163,274  
Operating income / (loss)
    6,357,218       (2,018,854 )     (7,313,783 )
Net loss
    (16,902 )     (8,413,047 )     (14,856,082 )