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Note 3 -Transactions with Related Parties (Detail) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Reimbursed Compensation Manager [Member]
Dec. 31, 2011
Reimbursed Compensation Manager [Member]
Dec. 31, 2010
Reimbursed Compensation Manager [Member]
Dec. 31, 2012
Office Space Rent [Member]
Dec. 31, 2011
Office Space Rent [Member]
Dec. 31, 2010
Office Space Rent [Member]
Dec. 31, 2012
Emihar Petroleum Inc [Member]
Sep. 28, 2012
Affiliated Company [Member]
Dec. 31, 2012
Affiliated Company [Member]
Dec. 31, 2012
Additional Charge Per Day For Superintendent Engineers Onboard The Vessel [Member]
Dec. 31, 2012
Superintendent Fees [Member]
Dec. 31, 2011
Superintendent Fees [Member]
Dec. 31, 2010
Superintendent Fees [Member]
Dec. 31, 2012
Commission Expenses [Member]
Dec. 31, 2011
Commission Expenses [Member]
Dec. 31, 2010
Commission Expenses [Member]
Dec. 31, 2012
Vessels' Operating Expenses [Member]
Management Fee Per Day Per Vessel $ 440                                      
Management Fee Per Day Per Vessel Under Bareboat Charter 125                                      
Vessel Brokerage Commission Pecentage 1.25%                                      
Vessel Brokerage Commission 1,472,410 1,474,495 1,396,877                                  
Professional and Contract Services Expense 4,315,720 4,760,865 5,184,055                                  
Related Party Transaction, Expenses from Transactions with Related Party                         500 175,500 208,000 0        
Sales and Purchase Broker Commission Fee Percentage 1.00%                                      
Salesand Purchase Broker Commission Fee 634,479 621,745 565,000                                  
Net (gain) loss on sale of vessels                                 192,000 258,500 381,300  
General and Administrative Expense 2,838,759 2,646,418 3,031,491 1,552,541 1,192,266 1,311,363                            
Due to Related Parties, Current 7,288,899 7,874,990                                    
Related Party Transaction, Amounts of Transaction             76,420 57,850 55,214                     1,741,802
Revenue from Related Parties 4,364,992                 4,364,992                    
Vessel Purchase Price                       96,000,000                
Advances Percentage For Vessels Under Construction Acquisitions                     20.00%                  
Advances for vessels under construction and acquisitions $ 61,632,129 $ 52,797,646                 $ 19,200,000