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Note 8 - Property, Plant and Equipment and Construction-in-process - Construction-in-process (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Construction-in-process | $ 293,542 | $ 306,709 |  |
Projects Under Exploration and Development [Member] |  |  |  |
Construction-in-process | 63,875 | 54,447 | $ 62,920 | $ 73,431
Projects Under Exploration and Development [Member] | Up-front Bonus Lease Costs [Member] |  |  |  |
Construction-in-process | 17,018 | 17,385 | 26,491 | 26,618
Projects Under Exploration and Development [Member] | Exploration and Development Costs [Member] |  |  |  |
Construction-in-process | 46,154 | 36,359 | 35,726 | 45,977
Projects Under Exploration and Development [Member] | Interest Capitalized [Member] |  |  |  |
Construction-in-process | 703 | 703 | $ 703 | $ 836
Projects Under Construction [Member] |  |  |  |
Construction-in-process | 229,667 | 252,262 |  |
Projects Under Construction [Member] | Up-front Bonus Lease Costs [Member] |  |  |  |
Construction-in-process | 27,473 | 37,713 |  |
Projects Under Construction [Member] | Interest Capitalized [Member] |  |  |  |
Construction-in-process | 3,251 | 12,338 |  |
Projects Under Construction [Member] | Drilling And Construction Costs [Member] |  |  |  |
Construction-in-process | $ 198,943 | $ 202,211 |  |

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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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