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Note 7 - Fair Value of Financial Instruments - Amounts of Gain (Loss) Recognized in Condensed Consolidated Statements on Derivative Instruments Not Designated as Hedges (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Amount of gain (loss) recognized | $ 5,268 | $ (3,942) | $ (48)
Foreign Currency Gain (Loss) [Member] | Put Options on Natural Gas Price [Member] |  |  |
Amount of gain (loss) recognized | (350) |  |
Foreign Currency Gain (Loss) [Member] | Call Option on Natural Gas Price [Member] |  |  |
Amount of gain (loss) recognized |  | (1,340) |
Foreign Currency Gain (Loss) [Member] | Call and Put Options on Oil Price [Member] |  |  |
Amount of gain (loss) recognized |  | (1,313) |
Foreign Currency Gain (Loss) [Member] | Contingent Considerations [Member] |  |  |
Amount of gain (loss) recognized | (129) | (1,527) |
Foreign Currency Gain (Loss) [Member] | Currency Forward Contracts [Member] |  |  |
Amount of gain (loss) recognized | 3,699 | 238 | (1,206)
Electricity Revenues [Member] | Natural Gas Price Swap [Member] |  |  |
Amount of gain (loss) recognized |  |  | 1,158
General and Administrative Expense [Member] | Contingent Considerations [Member] |  |  |
Amount of gain (loss) recognized | $ 2,048 |  |

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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