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Note 14 - Voyage, Vessel Operating Expenses and Commissions (Detail) - Summary of Voyage, Vessel Operating Expenses, and Commissions (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Voyage Expense $ 1,329,668 $ 777,902 $ 1,596,569
Crews Wages and Related Costs (Member)
      
Vessel Operating Expenses 13,864,535 14,137,227 12,144,125
Insurance (Member)
      
Vessel Operating Expenses 2,435,144 2,691,918 2,521,256
Repairs and Maintenance (Member)
      
Vessel Operating Expenses 511,569 601,254 524,026
Lubricants [Member]
      
Vessel Operating Expenses 2,846,087 2,712,901 2,187,351
Spares and Consumable Stores (Member)
      
Vessel Operating Expenses 4,083,590 4,590,835 3,252,381
Professional and Legal Fees (Member)
      
Vessel Operating Expenses 137,047 111,043 113,202
Other - Vessel Operating Expenses (Member)
      
Vessel Operating Expenses 1,197,167 1,404,161 764,851
Total Vessel Operating Expenses (Member)
      
Vessel Operating Expenses 25,075,139 26,249,339 21,507,192
Port Charges and Canal Dues (Member)
      
Voyage Expense 442,783 304,951 578,520
Laid-Up Vessel Re-Activation Costs (Member)
      
Voyage Expense     565,653
Bunkers [Member]
      
Voyage Expense 886,885 472,951 452,396
Total Voyage Expense (Member)
      
Voyage Expense $ 1,329,668 $ 777,902 $ 1,596,569