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Note 7 - Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  |  |  |  |  | December 31, 2017 |
|  |  |  |  |  | Fair Value |
|  | Carrying Value at December 31, 2017 |  |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
|  | (Dollars in thousands) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents (including restricted cash accounts) |  | $ | 18,359 |  |  | $ | 18,359 |  |  | $ | 18,359 |  |  | $ | — |  |  | $ | — |
Derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent receivable (1) |  |  | 108 |  |  |  | 108 |  |  |  | — |  |  |  | — |  |  |  | 108 |
Currency forward contracts (2) |  |  | 992 |  |  |  | 992 |  |  |  | — |  |  |  | 992 |  |  |  | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent payables (1) |  |  | (13,904 | ) |  |  | (13,904 | ) |  |  | — |  |  |  | — |  |  |  | (13,904 | )
Warrants (1) |  |  | (3,967 | ) |  |  | (3,967 | ) |  |  | — |  |  |  | — |  |  |  | (3,967 | )
|  | $ | 1,588 |  |  | $ | 1,588 |  |  | $ | 18,359 |  |  | $ | 992 |  |  | $ | (17,763 | )
|  |  |  |  |  | December 31, 2016 |
|  |  |  |  |  | Fair Value |
|  | Carrying Value at December 31, 2016 |  |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
|  | (Dollars in thousands) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents (including restricted cash accounts) |  | $ | 14,922 |  |  | $ | 14,922 |  |  | $ | 14,922 |  |  | $ | — |  |  | $ | — |
Derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent receivable (1) |  |  | 1,443 |  |  |  | 1,443 |  |  |  | — |  |  |  | — |  |  |  | 1,443 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent payables (1) |  |  | (11,581 | ) |  |  | (11,581 | ) |  |  | — |  |  |  | — |  |  |  | (11,581 | )
Warrants (1) |  |  | (3,429 | ) |  |  | (3,429 | ) |  |  | — |  |  |  | — |  |  |  | (3,429 | )
Currency forward contracts (2) |  |  | (481 | ) |  |  | (481 | ) |  |  | — |  |  |  | (481 | ) |  |  | — |
|  | $ | 874 |  |  | $ | 874 |  |  | $ | 14,922 |  |  | $ | (481 | ) |  | $ | (13,567 | )
Derivative Instruments, Gain (Loss) [Table Text Block] |
Derivatives not designated as hedging instruments |  | Location of recognized gain (loss) |  | Amount of recognized gain (loss) |
|  |  |  | 2017 |  |  | 2016 |  |  | 2015 |
|  |  |  | (Dollars in thousands) |
Put options on natural gas price |  | Derivative and foreign currency transaction gains (losses) |  |  | (350 | ) |  |  | — |  |  |  | — |
Call options on natural gas price |  | Derivative and foreign currency transaction gains (losses) |  |  | — |  |  |  | (1,340 | ) |  |  | — |
Call and put options on oil price |  | Derivative and foreign currency transaction gains (losses) |  |  | — |  |  |  | (1,313 | ) |  |  | — |
Swap transactions on natural gas price |  | Electricity revenues |  |  | — |  |  |  | — |  |  |  | 1,158 |
Contingent considerations |  | Derivative and foreign currency transaction gains (losses) |  |  | (129 | ) |  |  | (1,527 | ) |  |  | — |
Contingent considerations |  | General and administrative expenses |  |  | 2,048 |  |  |  | — |  |  |  | — |
Currency forward contracts |  | Derivative and foreign currency transaction gains (losses) |  |  | 3,699 |  |  |  | 238 |  |  |  | (1,206 | )
|  |  |  | $ | 5,268 |  |  | $ | (3,942 | ) |  | $ | (48 | )
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] |
|  | Fair Value |  |  | Carrying Amount |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
|  | (Dollars in millions) |  |  | (Dollars in millions) |
Olkaria III Loan - DEG |  | $ | — |  |  | $ | 16.3 |  |  | $ | — |  |  | $ | 15.8 |
Olkaria III Loan - OPIC |  |  | 234.6 |  |  |  | 253.4 |  |  |  | 228.6 |  |  |  | 246.6 |
Olkaria IV Loan - DEG 2 |  |  | 50.7 |  |  |  | 50.9 |  |  |  | 50.0 |  |  |  | 50.0 |
Amatitlan Loan |  |  | 32.8 |  |  |  | 37.3 |  |  |  | 33.3 |  |  |  | 36.8 |
Senior Secured Notes: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ormat Funding Corp. ("OFC") |  |  | — |  |  |  | 17.0 |  |  |  | — |  |  |  | 17.0 |
OrCal Geothermal Inc. ("OrCal") |  |  | 34.2 |  |  |  | 37.4 |  |  |  | 32.1 |  |  |  | 35.2 |
OFC 2 LLC ("OFC 2") |  |  | 234.6 |  |  |  | 249.0 |  |  |  | 232.5 |  |  |  | 247.2 |
Don A. Campbell 1 ("DAC 1") |  |  | 85.5 |  |  |  | 88.9 |  |  |  | 88.3 |  |  |  | 92.4 |
Senior Unsecured Bonds |  |  | 200.3 |  |  |  | 200.1 |  |  |  | 204.3 |  |  |  | 204.3 |
Other long-term debt |  |  | 7.0 |  |  |  | 10.4 |  |  |  | 7.9 |  |  |  | 11.2 |
Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis [Table Text Block] |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
|  | (Dollars in millions) |
Olkaria III - OPIC |  | $ | — |  |  | $ | — |  |  | $ | 234.6 |  |  | $ | 234.6 |
Olkaria IV - DEG 2 |  |  | — |  |  |  | — |  |  |  | 50.7 |  |  |  | 50.7 |
Amatitlan Loan |  |  | — |  |  |  | 32.8 |  |  |  | — |  |  |  | 32.8 |
Senior Secured Notes: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
OrCal Senior Secured Notes |  |  | — |  |  |  | — |  |  |  | 34.2 |  |  |  | 34.2 |
OFC 2 Senior Secured Notes |  |  | — |  |  |  | — |  |  |  | 234.6 |  |  |  | 234.6 |
DAC 1 Senior Secured Notes |  |  | — |  |  |  | — |  |  |  | 85.5 |  |  |  | 85.5 |
Senior Unsecured Bonds |  |  | — |  |  |  | — |  |  |  | 200.3 |  |  |  | 200.3 |
Other long-term debt |  |  | — |  |  |  | — |  |  |  | 7.0 |  |  |  | 7.0 |
Revolving lines of credit |  |  | — |  |  |  | 51.5 |  |  |  | — |  |  |  | 51.5 |
Deposits |  |  | 15.6 |  |  |  | — |  |  |  | — |  |  |  | 15.6 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
|  | (Dollars in millions) |
Olkaria III Loan - DEG |  | $ | — |  |  | $ | — |  |  | $ | 16.3 |  |  | $ | 16.3 |
Olkaria III Loan - OPIC |  |  | — |  |  |  | — |  |  |  | 253.4 |  |  |  | 253.4 |
Olkaria IV - DEG 2 |  |  |  |  |  |  |  |  |  |  | 50.9 |  |  |  | 50.9 |
Amatitlan Loan |  |  | — |  |  |  | 37.3 |  |  |  | — |  |  |  | 37.3 |
Senior Secured Notes: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
OFC Senior Secured Notes |  |  | — |  |  |  | 17.0 |  |  |  | — |  |  |  | 17.0 |
OrCal Senior Secured Notes |  |  | — |  |  |  | — |  |  |  | 37.4 |  |  |  | 37.4 |
OFC 2 Senior Secured Notes |  |  | — |  |  |  | — |  |  |  | 249.0 |  |  |  | 249.0 |
DAC 1 Senior Secured Notes |  |  | — |  |  |  | — |  |  |  | 88.9 |  |  |  | 88.9 |
Senior Unsecured Bonds |  |  | — |  |  |  | — |  |  |  | 200.1 |  |  |  | 200.1 |
Other long-term debt |  |  | — |  |  |  | 3.3 |  |  |  | 7.1 |  |  |  | 10.4 |
Revolving lines of credit |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Deposits |  |  | 14.4 |  |  |  | — |  |  |  | — |  |  |  | 14.4 |

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