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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% |  |

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- Definition Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6509736 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Subsection 7 + Details
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