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Note 1 - Business and Significant Accounting Policies (Details Textual) - USD ($) |  |  |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 07, 2018 | Mar. 01, 2018 | Mar. 15, 2017 | 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, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 01, 2018 | Jan. 01, 2015 | Dec. 31, 2014
Income Tax Expense (Benefit), Total |  |  |  | $ (28,329,000) | $ 6,224,000 | $ 32,765,000 | $ 11,004,000 | $ 7,356,000 | $ 12,109,000 | $ 8,515,000 | $ 9,079,000 |  | $ 21,664,000 | $ 37,059,000 | $ (16,057,000) |  |  |
Deferred Tax Liabilities, Net, Noncurrent |  |  |  | 61,961,000 |  |  |  | 36,411,000 |  |  |  |  | 61,961,000 | 36,411,000 | 28,989,000 |  |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent, Total |  |  |  | 57,337,000 |  |  |  |  |  |  |  |  | 57,337,000 |  |  |  |  |
Deferred Tax Assets, Net, Noncurrent |  |  |  | 57,337,000 |  |  |  |  |  |  |  |  | 57,337,000 |  |  |  |  |
Retained Earnings (Accumulated Deficit), Ending Balance |  |  |  | 327,255,000 |  |  |  | 215,352,000 |  |  |  |  | 327,255,000 | 215,352,000 | 152,326,000 |  |  | $ 44,670,000
Dividends, Common Stock, Cash |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,500,000 | $ 25,700,000 | $ 12.70 |  |  |
Common Stock, Dividends, Per Share, Declared |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.41 | $ 0.52 | $ 0.26 |  |  |
Accounts Receivable, Net, Current, Total |  |  |  | 110,410,000 |  |  |  | 80,807,000 |  |  |  |  | $ 110,410,000 | $ 80,807,000 |  |  |  |
Provision for Doubtful Accounts |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Interest Costs Capitalized |  |  |  |  |  |  |  |  |  |  |  |  | 7,224,000 | 3,287,000 | $ 4,075,000 |  |  |
Exploration Abandonment and Impairment Expense |  |  |  | 1,796,000 |  |  |  | 303,000 | 1,294,000 | 863,000 | 557,000 |  | 1,796,000 | 3,017,000 | 1,579,000 |  |  |
Grants Received to Offset Exploration and Development Costs Incurred |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 300,000 | 800,000 |  |  |
Accumulated Amortization, Debt Issuance Costs |  |  |  | 31,000,000 |  |  |  | 31,100,000 |  |  |  |  | 31,000,000 | 31,100,000 |  |  |  |
Amortization of Debt Issuance Costs |  |  |  |  |  |  |  |  |  |  |  |  | 5,700,000 | 6,900,000 | 8,800,000 |  |  |
Write off of Deferred Debt Issuance Cost |  |  |  |  |  |  |  |  |  |  |  |  | 600,000 | 100,000 | 500,000 |  |  |
Deferred Costs, Leasing, Gross |  |  |  | 4,200,000 |  |  |  |  |  |  |  |  | $ 4,200,000 |  |  |  |  |
Lease Payment Term |  |  |  |  |  |  |  |  |  |  |  |  | 23 years |  |  |  |  |
Goodwill, Impairment Loss |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | 0 |  |  |  |
Impairment of Long-Lived Assets to be Disposed of |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax, Ending Balance |  |  |  | 1,400,000 |  |  |  | 1,200,000 |  |  |  |  | 1,400,000 | 1,200,000 |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  |  |  |  |  | 11,000,000 | 9,000,000 | 27,000,000 |  |  |
Interest Expense, Total |  |  |  | 12,987,000 | 11,692,000 | 14,540,000 | 14,923,000 | 15,828,000 | 17,137,000 | 18,401,000 | 16,023,000 |  | $ 54,142,000 | $ 67,389,000 | $ 72,577,000 |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 35.00% |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  |  |  |  |  |  |  |  |  |  | 42,896 | 102,793 | 467,766 |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total |  |  |  | (4,706,000) |  |  |  | (8,175,000) |  |  |  |  | $ (4,706,000) | $ (8,175,000) | $ (8,164,000) |  |  | (9,221,000)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest, Total |  |  |  |  |  |  |  |  |  |  |  |  | 151,415,000 | 95,876,000 | 125,205,000 |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total |  |  |  | 68,087,000 | $ 27,559,000 | $ 11,846,000 | $ 39,617,000 | 26,326,000 | $ 14,285,000 | $ 24,308,000 | $ 31,375,000 |  | 147,109,000 | 96,294,000 | 124,148,000 |  |  |
Research and Development Arrangement with Federal Government, Customer Funding to Offset Costs Incurred |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 |  |  |
Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.41 | $ 0.52 | $ 0.26 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ 0.10 | $ 0.23 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Accounting Standards Update 2016-16 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,500,000 |  |
Subsequent Event [Member] | Accounting Standards Update 2014-09 [Member] | Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24,100,000 |  |
Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  |  |  |  |  |  |  |  | 21.00% |  |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Expense (Benefit), Total |  |  |  |  |  |  |  |  |  |  |  |  | $ (5,000,000) | $ (3,000,000) | $ (17,000,000) |  |  |
Interest Expense, Total |  |  |  |  |  |  |  |  |  |  |  |  | $ (16,000,000) | (12,000,000) | (44,000,000) |  |  |
Viridity Energy, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 19 years |  |  |  |  |  |  |  |  |  | 19 years |  |  |  |  |
Puna Geothermal Ventures [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Costs, Leasing, Gross |  |  |  | 4,200,000 |  |  |  |  |  |  |  |  | $ 4,200,000 |  |  |  |  |
Lease Payment Term |  |  |  |  |  |  |  |  |  |  |  |  | 23 years |  |  |  |  |
Deferred Costs, Leasing, Accumulated Amortization |  |  |  | 2,300,000 |  |  |  | 2,100,000 |  |  |  |  | $ 2,300,000 | 2,100,000 |  |  |  |
Amortization of Deferred Leasing Fees |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000 | $ 200,000 | 200,000 |  |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Primary Customers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 57.00% | 60.00% |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash, FDIC Insured Amount |  |  |  | 250,000 |  |  |  |  |  |  |  |  | $ 250,000 |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  |  |  |  |  |  | 25 years |  |  |  |  |
Maximum [Member] | Subsequent Event [Member] | Accounting Standards Update 2016-16 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 59,300,000 |  |
Maximum [Member] | Power Plants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  |  |  |  |  | 30 years |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  |  |  |  |  |  | 13 years |  |  |  |  |
Minimum [Member] | Subsequent Event [Member] | Accounting Standards Update 2016-16 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 49,800,000 |  |
Minimum [Member] | Power Plants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |
UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash, Cash Equivalents, and Short-term Investments, Total |  |  |  | 21,200,000 |  |  |  | 72,500,000 |  |  |  |  | $ 21,200,000 | $ 72,500,000 |  |  |  |
Foreign Countries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash, Cash Equivalents, and Short-term Investments, Total |  |  |  | 32,800,000 |  |  |  | 166,200,000 |  |  |  |  | 32,800,000 | 166,200,000 |  |  |  |
Accounts Receivable, Net, Current, Total |  |  |  | 78,100,000 |  |  |  | 53,300,000 |  |  |  |  | 78,100,000 | 53,300,000 |  |  |  |
Restatement Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Expense (Benefit), Total |  |  |  | 1,300,000 |  |  |  | 4,900,000 |  |  |  |  | 23,075,000 | 5,222,000 | (799,000) |  |  |
Deferred Tax Liabilities, Net, Noncurrent |  |  |  | 61,961,000 |  |  |  | 1,029,000 |  |  |  |  | 61,961,000 | 1,029,000 |  |  |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent, Total |  |  |  | (24,800,000) |  |  |  |  |  |  |  |  | (24,800,000) |  |  |  |  |
Deferred Tax Assets, Net, Noncurrent |  |  |  | 37,202,000 |  |  |  |  |  |  |  |  | 37,202,000 |  |  |  |  |
Retained Earnings (Accumulated Deficit), Ending Balance |  |  |  | (24,367,000) |  |  |  | (1,292,000) |  |  |  |  | (24,367,000) | (1,292,000) | 3,930,000 |  | $ 3,100,000 | 3,131,000
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total |  |  |  | $ (392,000) |  |  |  | $ (443,000) |  |  |  |  | (392,000) | (443,000) | (497,000) |  |  | $ (553,000)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest, Total |  |  |  |  |  |  |  |  |  |  |  |  | (23,024,000) | (5,168,000) | 855,000 |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total |  |  |  |  |  |  |  |  |  |  |  |  | $ (23,075,000) | $ (5,222,000) | $ 799,000 |  |  |

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