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Note 4 - Advances for Vessels under Construction (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 2 Vessels [Member] | Dec. 31, 2013 Vessels [Member]
Note 4 - Advances for Vessels under Construction (Details) [Line Items] |  |  |  |  |
Long-term Purchase Commitment, Amount | $ 19,030,000 | $ 27,190,000 | $ 8,160,000 | $ 56,000,000 |
Construction in Progress, Gross |  |  |  |  | $ 50,122

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- Definition Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
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