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Note 11 - Long-term Debt and Credit Agreements (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Long-term Debt Instruments [Table Text Block] |
|  | December 31, |
|  | 2017 |  |  | 2016 |
|  | (Dollars in thousands) |
Limited and non-recourse agreements: |  |  |  |  |  |  |  |
Loans: |  |  |  |  |  |  |  |
Non-recourse: |  |  |  |  |  |  |  |
Other loans |  | $ | 7,252 |  |  | $ | 6,368 |
Limited recourse: |  |  |  |  |  |  |  |
Loan agreement with OPIC (the Olkaria III power plant) |  |  | 228,635 |  |  |  | 246,630 |
Loan agreement with Banco Industrial S.A. and Westrust Bank (International) Limited |  |  | 33,251 |  |  |  | 36,750 |
Senior Secured Notes: |  |  |  |  |  |  |  |
Non-recourse: |  |  |  |  |  |  |  |
OFC Senior Secured Notes |  |  | - |  |  |  | 17,026 |
OrCal Senior Secured Notes |  |  | 32,142 |  |  |  | 35,181 |
DAC 1 Senior Secured Notes |  |  | 88,339 |  |  |  | 92,361 |
Limited recourse: |  |  |  |  |  |  |  |
OFC 2 Senior Secured Notes |  |  | 232,526 |  |  |  | 247,232 |
|  |  | 622,145 |  |  |  | 681,548 |
Less current portion |  |  | (54,720 | ) |  |  | (53,729 | )
Non current portion |  | $ | 567,425 |  |  | $ | 627,819 |
Full recourse agreements: |  |  |  |  |  |  |  |
Senior Unsecured Bonds |  | $ | 204,332 |  |  | $ | 204,332 |
Loans from institutional investors |  |  | - |  |  |  | 3,333 |
Loan agreements with DEG (the Olkaria III and IV power plants) |  |  | 50,000 |  |  |  | 65,789 |
Loan from a commercial bank |  |  | 587 |  |  |  | 1,529 |
Revolving credit lines with banks |  |  | 51,500 |  |  |  | - |
|  |  | 306,419 |  |  |  | 274,983 |
Less current portion |  |  | (54,587 | ) |  |  | (12,242 | )
Non current portion |  | $ | 251,832 |  |  | $ | 262,741 |
Schedule of Maturities of Long-term Debt [Table Text Block] |
|  | (Dollars in thousands) |
Year ending December 31: |  |  |  |
2018 |  | $ | 57,807 |
2019 |  |  | 55,539 |
2020 |  |  | 123,093 |
2021 |  |  | 46,579 |
2022 |  |  | 184,148 |
Thereafter |  |  | 409,898 |
Total |  | $ | 877,064 |

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644 + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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