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Note 15 - Voyage, Vessel Operating Expenses and Commissions (Details) - Commission Consisted of Commissions Charged (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |
Commissions | $ 1,936,381 | $ 2,673,703 | $ 2,972,967
Third Parties (Member) |  |  |
Segment Reporting Information [Line Items] |  |  |
Commissions | 1,461,915 | 2,032,599 | 2,206,663
Related Parties (Member) |  |  |
Segment Reporting Information [Line Items] |  |  |
Commissions | $ 474,466 | $ 641,104 | $ 766,304

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- Definition The amount of cash paid for commissions during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
Name: | us-gaap_PaymentsForCommissions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration