Note 8 - Commitments and Contingencies (Details Textual) $ in Thousands	Jun. 30, 2017 USD ($)
Contractual Obligation	$ 60,140
Contractual Obligation, Due in Next Fiscal Year	11,975
Contractual Obligation, Due in Second Year	48,165
Commitment Pursuant to Newbuilding Agreement for Hull No S443 [Member]
Contractual Obligation	13,708
Commitment Pursuant to Newbuilding Agreement for Hull No S444 [Member]
Contractual Obligation	14,455
Commitment Pursuant to Newbuilding Agreement for Hull No 2648 [Member]
Contractual Obligation	$ 31,977
City of Athens [Member]
Equity Method Investment, Ownership Percentage	50.00%
Astarte [Member]
Equity Method Investment, Ownership Percentage	100.00%
Eco Nine [Member]
Equity Method Investment, Ownership Percentage	50.00%

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

No definition available.

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- Definition

Amount of contractual obligation due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

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- Definition

Amount of contractual obligation due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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