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Note 5 - Investment In an Unconsolidated Company (Details Textual) $ in Thousands |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 04, 2014 USD ($) | Dec. 31, 2017 USD ($) MWh | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | May 23, 2014 USD ($) | May 16, 2014 USD ($) | Oct. 31, 2013 USD ($)
Number of Commercial Lenders in Funding Consortium |  |  |  |  |  | 6 |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  | $ 804 | $ 1,185 | $ 1,028 |  |  |
Sarulla [Member] | Lenders Consortium [Member] |  |  |  |  |  |  |
Senior Notes, Total |  |  |  |  |  | $ 1,170,000 |
Sarulla [Member] |  |  |  |  |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share |  | 12.75% |  |  |  |  |
Expected Power Generating Capacity | MWh |  | 330 |  |  |  |  |
Power Plant Usage Agreement Term |  | 30 years |  |  |  |  |
Number of Phases of Construction |  | 3 |  |  |  |  |
Power Utilization | MWh |  | 110 |  |  |  |  |
Percentage of Required Production Capacity |  | 100.00% |  |  |  |  |
Percentage of Required Injection Capacity |  | 85.00% |  |  |  |  |
Supply Commitment, Remaining Minimum Amount Committed |  |  |  |  |  |  | $ 255,600
Payments to Acquire Projects |  | $ 46,300 |  |  |  |  |
Accumulated Cash Contributions to Acquire Projects |  | $ 58,200 |  |  |  |  |
Contract Effective Date |  | April 4, 2013 |  |  |  |  |
Sarulla [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  | $ 800 | 1,200 |  |  |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax, Ending Balance |  | (5,100) |  |  |  |  |
Sarulla [Member] | Interest Rate Swap [Member] | Sarulla Project Company [Member] |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  | $ 6,300 | $ 9,300 |  |  |  |
Sarulla [Member] | Lenders Consortium [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |
Proceeds from Issuance of Senior Long-term Debt | $ 50,000 |  |  |  |  |  |
Sarulla [Member] | Lenders Consortium [Member] | Interest Rate Swap [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 3.4565% |  |  |  |  |  |
Sarulla [Member] | Lenders Consortium [Member] | Subject to Fixed Interest Rate [Member] |  |  |  |  |  |  |
Senior Notes, Total |  |  |  |  | $ 100,000 |  |
Sarulla [Member] | Lenders Consortium [Member] | Subject to Fixed LIBOR Interest Rate [Member] |  |  |  |  |  |  |
Senior Notes, Total |  |  |  |  | $ 1,070,000 |  |
Sarulla [Member] | Lenders Consortium [Member] | Subject to Fixed LIBOR Interest Rate [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |
Senior Notes, Total | $ 960,000 |  |  |  |  |  |

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