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Note 24 - Subsequent Events (Details Textual) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Mar. 01, 2018 USD ($) $ / shares | Jan. 24, 2018 USD ($) MWh $ / shares | Dec. 31, 2017 USD ($) $ / shares | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($) $ / shares
Dividends, Common Stock | $ |  |  | $ 20,511 | $ 25,682 | $ 12,716
Common Stock, Dividends, Per Share, Declared | $ / shares |  |  | $ 0.41 | $ 0.52 | $ 0.26
Subsequent Event [Member] |  |  |  |  |
Dividends, Common Stock | $ | $ 11,500 |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ / shares | $ 0.23 |  |  |  |
Subsequent Event [Member] | U.S. Geothermal [Member] |  |  |  |  |
Expected Power Generating Capacity | MWh |  | 45 |  |  |
Current Power Generation | MWh |  | 38 |  |  |
Subsequent Event [Member] | U.S. Geothermal [Member] |  |  |  |  |
Business Acquisition, Share Price | $ / shares |  | $ 5.45 |  |  |
Business Combination, Consideration Transferred | $ |  | $ 109,900 |  |  |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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