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Note 8 - Property, Plant and Equipment and Construction-in-process - Activity in Construction and Development (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Balance |  |  |  | $ 306,709 |  |  |  |  | $ 306,709 |  |
Write off of unsuccessful exploration costs | $ (1,796) |  |  |  | $ (303) | $ (1,294) | $ (863) | $ (557) | (1,796) | $ (3,017) | $ (1,579)
Balance | 293,542 |  |  |  | 306,709 |  |  |  | 293,542 | 306,709 |
Projects Under Exploration and Development [Member] |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | 54,447 |  |  |  | 62,920 | 54,447 | 62,920 | 73,431
Cost incurred during the year |  |  |  |  |  |  |  |  | 11,224 | 26,679 | 11,010
Write off of unsuccessful exploration costs |  |  |  |  |  |  |  |  | (1,796) | (3,017) | (1,579)
Transfer of projects under exploration and development to projects under construction |  |  |  |  |  |  |  |  |  | (32,135) | (19,942)
Balance | 63,875 |  |  |  | 54,447 |  |  |  | 63,875 | 54,447 | 62,920
Projects Under Exploration and Development [Member] | Up-front Bonus Lease Costs [Member] |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | 17,385 |  |  |  | 26,491 | 17,385 | 26,491 | 26,618
Cost incurred during the year |  |  |  |  |  |  |  |  |  | 1,514 | 37
Write off of unsuccessful exploration costs |  |  |  |  |  |  |  |  | (367) | (380) | (164)
Transfer of projects under exploration and development to projects under construction |  |  |  |  |  |  |  |  |  | (10,240) |
Balance | 17,018 |  |  |  | 17,385 |  |  |  | 17,018 | 17,385 | 26,491
Projects Under Exploration and Development [Member] | Exploration and Development Costs [Member] |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | 36,359 |  |  |  | 35,726 | 36,359 | 35,726 | 45,977
Cost incurred during the year |  |  |  |  |  |  |  |  | 11,224 | 25,165 | 10,104
Write off of unsuccessful exploration costs |  |  |  |  |  |  |  |  | (1,429) | (2,637) | (1,415)
Transfer of projects under exploration and development to projects under construction |  |  |  |  |  |  |  |  |  | (21,895) | (18,940)
Balance | 46,154 |  |  |  | 36,359 |  |  |  | 46,154 | 36,359 | 35,726
Projects Under Exploration and Development [Member] | Interest Capitalized [Member] |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | 703 |  |  |  | 703 | 703 | 703 | 836
Cost incurred during the year |  |  |  |  |  |  |  |  |  |  | 869
Write off of unsuccessful exploration costs |  |  |  |  |  |  |  |  |  |  |
Transfer of projects under exploration and development to projects under construction |  |  |  |  |  |  |  |  |  |  | (1,002)
Balance | 703 |  |  |  | 703 |  |  |  | 703 | 703 | 703
Construction in Progress [Member] |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | 252,262 |  |  |  | 185,915 | 252,262 | 185,915 | 223,291
Cost incurred during the year |  |  |  |  |  |  |  |  | 239,226 | 122,757 | 144,533
Transfer of projects under exploration and development to projects under construction |  |  |  |  |  |  |  |  |  | 32,135 | 19,942
Transfer of completed projects to property, plant and equipment |  |  |  |  |  |  |  |  | (261,821) | (88,545) | (201,851)
Balance | 229,667 |  |  |  | 252,262 |  |  |  | 229,667 | 252,262 | 185,915
Construction in Progress [Member] | Up-front Bonus Lease Costs [Member] |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | 37,713 |  |  |  | 27,473 | 37,713 | 27,473 | 27,473
Cost incurred during the year |  |  |  |  |  |  |  |  |  |  |
Transfer of projects under exploration and development to projects under construction |  |  |  |  |  |  |  |  |  | 10,240 |
Transfer of completed projects to property, plant and equipment |  |  |  |  |  |  |  |  | (10,240) |  |
Balance | 27,473 |  |  |  | 37,713 |  |  |  | 27,473 | 37,713 | 27,473
Construction in Progress [Member] | Drilling And Construction Costs [Member] |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | 202,211 |  |  |  | 150,467 | 202,211 | 150,467 | 187,545
Cost incurred during the year |  |  |  |  |  |  |  |  | 231,926 | 116,247 | 140,977
Transfer of projects under exploration and development to projects under construction |  |  |  |  |  |  |  |  |  | 21,895 | 18,940
Transfer of completed projects to property, plant and equipment |  |  |  |  |  |  |  |  | (235,194) | (86,398) | (196,995)
Balance | 198,943 |  |  |  | 202,211 |  |  |  | 198,943 | 202,211 | 150,467
Construction in Progress [Member] | Interest Capitalized [Member] |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | $ 12,338 |  |  |  | $ 7,975 | 12,338 | 7,975 | 8,273
Cost incurred during the year |  |  |  |  |  |  |  |  | 7,300 | 6,510 | 3,556
Transfer of projects under exploration and development to projects under construction |  |  |  |  |  |  |  |  |  |  | 1,002
Transfer of completed projects to property, plant and equipment |  |  |  |  |  |  |  |  | (16,387) | (2,147) | (4,856)
Balance | $ 3,251 |  |  |  | $ 12,338 |  |  |  | $ 3,251 | $ 12,338 | $ 7,975

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