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Note 15 - Voyage, Vessel Operating Expenses and Commissions (Details) - Summary of Voyage, Vessel Operating Expenses, and Commissions (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Voyage expenses      
Voyage Expense $ 1,537,898 $ 1,329,668 $ 777,902
Port Charges and Canal Dues (Member)
      
Voyage expenses      
Voyage Expense 364,091 442,783 304,951
Bunkers [Member]
      
Voyage expenses      
Voyage Expense 1,173,807 886,885 472,951
Total Voyage Expense (Member)
      
Voyage expenses      
Voyage Expense 1,537,898 1,329,668 777,902
Crews Wages and Related Costs (Member)
      
Vessel operating expenses      
Vessel Operating Expenses 13,921,033 13,864,535 14,137,227
Insurance (Member)
      
Vessel operating expenses      
Vessel Operating Expenses 2,222,912 2,435,144 2,691,918
Repairs and Maintenance (Member)
      
Vessel operating expenses      
Vessel Operating Expenses 478,197 511,569 601,254
Lubricants [Member]
      
Vessel operating expenses      
Vessel Operating Expenses 2,836,561 2,846,087 2,712,901
Spares and Consumable Stores (Member)
      
Vessel operating expenses      
Vessel Operating Expenses 4,204,965 4,083,590 4,590,835
Professional and Legal Fees (Member)
      
Vessel operating expenses      
Vessel Operating Expenses 158,978 137,047 111,043
Other - Vessel Operating Expenses (Member)
      
Vessel operating expenses      
Vessel Operating Expenses 1,368,604 1,197,167 1,404,161
Total Vessel Operating Expenses (Member)
      
Vessel operating expenses      
Vessel Operating Expenses $ 25,191,250 $ 25,075,139 $ 26,249,339