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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

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- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

+ References

No definition available.

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