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Note 8 - Property, Plant and Equipment and Construction-in-process (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Property, Plant and Equipment [Table Text Block] |
|  | December 31 , |
|  | 2017 |  |  | 2016 |
|  | (Dollars in thousands ) |
Land owned by the Company where the geothermal resource is located |  | $ | 32,178 |  |  | $ | 31,904 |
Leasehold improvements |  |  | 3,984 |  |  |  | 3,848 |
Machinery and equipment |  |  | 182,121 |  |  |  | 152,821 |
Land, buildings and office equipment |  |  | 31,128 |  |  |  | 28,634 |
Automobiles |  |  | 12,596 |  |  |  | 11,161 |
Geothermal and recovered energy generation power plants, including geothermal wells and exploration and resource development costs: |  |  |  |  |  |  |  |
United States of America, net of cash grants and impairment charges |  |  | 1,744,728 |  |  |  | 1,658,195 |
Foreign countries |  |  | 700,498 |  |  |  | 541,626 |
Asset retirement cost |  |  | 10,563 |  |  |  | 8,669 |
|  |  | 2,717,797 |  |  |  | 2,436,858 |
Less accumulated depreciation |  |  | (983,106 | ) |  |  | (880,480 | )
Property, plant and equipment, net |  | $ | 1,734,691 |  |  | $ | 1,556,378 |
Construction In Progress [Table Text Block] |
|  | December 31, |
|  | 2017 |  |  | 2016 |
|  | (Dollars in thousands) |
Projects under exploration and development: |  |  |  |  |  |  |  |
Up-front bonus lease costs |  | $ | 17,018 |  |  | $ | 17,385 |
Exploration and development costs |  |  | 46,154 |  |  |  | 36,359 |
Interest capitalized |  |  | 703 |  |  |  | 703 |
|  |  | 63,875 |  |  |  | 54,447 |
Projects under construction: |  |  |  |  |  |  |  |
Up-front bonus lease costs |  |  | 27,473 |  |  |  | 37,713 |
Drilling and construction costs |  |  | 198,943 |  |  |  | 202,211 |
Interest capitalized |  |  | 3,251 |  |  |  | 12,338 |
|  |  | 229,667 |  |  |  | 252,262 |
Total |  | $ | 293,542 |  |  | $ | 306,709 |
Rollforward Of Construction In Process [Table Text Block] |
|  | Projects under Exploration and Development |
|  | Up-front Bonus Lease Costs |  |  | Exploration and Development Costs |  |  | Interest Capitalized |  |  | Total |
|  | (Dollars in thousands) |
Balance at December 31, 2014 |  | $ | 26,618 |  |  | $ | 45,977 |  |  | $ | 836 |  |  | $ | 73,431 |
Cost incurred during the year |  |  | 37 |  |  |  | 10,104 |  |  |  | 869 |  |  |  | 11,010 |
Write off of unsuccessful exploration costs |  |  | (164 | ) |  |  | (1,415 | ) |  |  | — |  |  |  | (1,579 | )
Transfer of projects under exploration and development to projects under construction |  |  | — |  |  |  | (18,940 | ) |  |  | (1,002 | ) |  |  | (19,942 | )
Balance at December 31, 2015 |  |  | 26,491 |  |  |  | 35,726 |  |  |  | 703 |  |  |  | 62,920 |
Cost incurred during the year |  |  | 1,514 |  |  |  | 25,165 |  |  |  | — |  |  |  | 26,679 |
Write off of unsuccessful exploration costs |  |  | (380 | ) |  |  | (2,637 | ) |  |  | — |  |  |  | (3,017 | )
Transfer of projects under exploration and development to projects under construction |  |  | (10,240 | ) |  |  | (21,895 | ) |  |  | — |  |  |  | (32,135 | )
Balance at December 31, 2016 |  |  | 17,385 |  |  |  | 36,359 |  |  |  | 703 |  |  |  | 54,447 |
Cost incurred during the year |  |  | — |  |  |  | 11,224 |  |  |  | — |  |  |  | 11,224 |
Write off of unsuccessful exploration costs |  |  | (367 | ) |  |  | (1,429 | ) |  |  | — |  |  |  | (1,796 | )
Balance at December 31, 2017 |  | $ | 17,018 |  |  | $ | 46,154 |  |  | $ | 703 |  |  | $ | 63,875 |
|  | Projects under Construction |
|  | Up-front Bonus Lease Costs |  |  | Drilling and Construction Costs |  |  | Interest Capitalized |  |  | Total |
|  | (Dollars in thousands) |
Balance at December 31, 2014 |  | $ | 27,473 |  |  | $ | 187,545 |  |  | $ | 8,273 |  |  | $ | 223,291 |
Cost incurred during the year |  |  | — |  |  |  | 140,977 |  |  |  | 3,556 |  |  |  | 144,533 |
Transfer of projects under exploration and development to projects under construction |  |  | — |  |  |  | 18,940 |  |  |  | 1,002 |  |  |  | 19,942 |
Transfer of completed projects to property, plant and equipment |  |  | — |  |  |  | (196,995 | ) |  |  | (4,856 | ) |  |  | (201,851 | )
Balance at December 31, 2015 |  |  | 27,473 |  |  |  | 150,467 |  |  |  | 7,975 |  |  |  | 185,915 |
Cost incurred during the year |  |  | — |  |  |  | 116,247 |  |  |  | 6,510 |  |  |  | 122,757 |
Transfer of exploration and development projects to projects under construction |  |  | 10,240 |  |  |  | 21,895 |  |  |  | — |  |  |  | 32,135 |
Transfer of completed projects to property, plant and equipment |  |  | — |  |  |  | (86,398 | ) |  |  | (2,147 | ) |  |  | (88,545 | )
Balance at December 31, 2016 |  |  | 37,713 |  |  |  | 202,211 |  |  |  | 12,338 |  |  |  | 252,262 |
Cost incurred during the year |  |  | — |  |  |  | 231,926 |  |  |  | 7,300 |  |  |  | 239,226 |
Transfer of completed projects to property, plant and equipment |  |  | (10,240 | ) |  |  | (235,194 | ) |  |  | (16,387 | ) |  |  | (261,821 | )
Balance at December 31, 2017 |  | $ | 27,473 |  |  | $ | 198,943 |  |  | $ | 3,251 |  |  | $ | 229,667 |

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