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Significant Accounting Policies (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
New Accounting Pronouncement Early Adoption [Line Items]      
Provision for Doubtful Accounts $ 602,128 $ 409,226  
Vessels Salvage Value Per Lightweight Ton 300    
Depreciation $ 16,913,785 18,357,377 $ 16,986,584
Long-term portion      
New Accounting Pronouncement Early Adoption [Line Items]      
Effect of change in accounting principle on long-term debt   3,638,418  
Current portion      
New Accounting Pronouncement Early Adoption [Line Items]      
Effect of change in accounting principle on long-term debt   722,533  
Computer Systems Software      
New Accounting Pronouncement Early Adoption [Line Items]      
Useful life 5 years    
Company Cars      
New Accounting Pronouncement Early Adoption [Line Items]      
Useful life 6 years    
Other Fixed Assets      
New Accounting Pronouncement Early Adoption [Line Items]      
Depreciation $ 226,428 $ 203,357 $ 164,527
Vessels      
New Accounting Pronouncement Early Adoption [Line Items]      
Useful life 25 years