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Income taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Loss before Taxes [Abstract]      
Domestic $ (3,808,877) $ (4,487,856) $ (2,961,844)
Foreign 0 0 0
Loss before taxes (3,808,877) (4,487,856) (2,961,844)
Components of the Provision for Income taxes [Abstract]      
Current tax expense (33,726) (26,896) (29,525)
Deferred tax expense / (benefit) 0 (24,341) 16,099
Income tax expense for year (33,726) (51,237) (13,426)
Deferred Tax (Expense) Benefit [Abstract]      
Non tonnage tax trade - net loss 0 0 126,873
Tax at 12.5% 0 0 15,859
Other 0 0 240
Change in valuation allowance 0 (24,341) 0
Reconciliation of Deferred Tax Assets [Abstract]      
Cumulative non tonnage tax trade-net loss 0 189,531 189,531
Deferred tax at 12.5% 0 23,691 23,691
Other 0 650 650
Total deferred tax assets 0 24,341 24,341
Valuation allowance 0 (24,341) 0
Net deferred tax asset $ 0 $ 0 $ 24,341
Statutory tax rate (in hundredths) 12.50%