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Note 23 - Quarterly Financial Information (Unaudited) - Quarterly Financial Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues: |  |  |  |  |  |  |  |  |  |  |
Electricity | $ 128,503 | $ 112,273 | $ 111,777 | $ 115,776 | $ 114,628 | $ 109,795 | $ 104,001 | $ 107,868 | $ 468,329 | $ 436,292 | $ 375,920
Product | 37,862 | 44,912 | 67,587 | 74,122 | 51,891 | 74,822 | 55,860 | 43,726 | 224,483 | 226,299 | 218,724
Total revenues | 166,365 | 157,185 | 179,364 | 189,898 | 166,519 | 184,617 | 159,861 | 151,594 | 692,812 | 662,591 | 594,644
Cost of revenues: |  |  |  |  |  |  |  |  |  |  |
Electricity | 75,017 | 65,774 | 65,439 | 66,036 | 69,163 | 66,481 | 62,243 | 63,686 | 272,266 | 261,573 | 242,612
Product | 26,992 | 32,218 | 43,432 | 49,452 | 30,719 | 43,647 | 31,822 | 24,035 | 152,094 | 130,223 | 133,753
Total cost of revenues | 102,009 | 97,992 | 108,871 | 115,488 | 99,882 | 110,128 | 94,065 | 87,721 | 424,360 | 391,796 | 376,365
Gross margin | 64,356 | 59,193 | 70,493 | 74,410 | 66,637 | 74,489 | 65,796 | 63,873 | 268,452 | 270,795 | 218,279
Operating expenses: |  |  |  |  |  |  |  |  |  |  |
Research and development expenses | 789 | 716 | 1,050 | 602 | 732 | 1,086 | 595 | 349 | 3,157 | 2,762 | 1,780
Selling and marketing expenses | 3,517 | 3,630 | 4,090 | 4,363 | 4,288 | 4,793 | 3,668 | 3,675 | 15,600 | 16,424 | 16,077
General and administrative expenses | 9,854 | 10,877 | 12,201 | 9,949 | 10,085 | 19,093 | 8,783 | 8,749 | 42,881 | 46,710 | 34,782
Write-off of unsuccessful exploration activities | 1,796 |  |  |  | 303 | 1,294 | 863 | 557 | 1,796 | 3,017 | 1,579
Operating income | 48,400 | 43,970 | 53,152 | 59,496 | 51,229 | 48,223 | 51,887 | 50,543 | 205,018 | 201,882 | 164,061
Interest income | 127 | 255 | 362 | 244 | 140 | 266 | 245 | 320 | 988 | 971 | 297
Interest expense, net | (12,987) | (11,692) | (14,540) | (14,923) | (15,828) | (17,137) | (18,401) | (16,023) | (54,142) | (67,389) | (72,577)
Derivatives and foreign currency transaction gains (losses) | 614 | (1,001) | 1,703 | 1,338 | (2,942) | (222) | (4,332) | 1,962 | 2,654 | (5,534) | (1,622)
Income attributable to sale of tax benefits | 3,859 | 3,506 | 4,356 | 6,157 | 4,123 | 3,463 | 4,519 | 4,398 | 17,878 | 16,503 | 25,431
Other non-operating income (expense), net | 12 | (1,592) | 6 | (92) | (39) | (5,546) | 49 | 191 | (1,666) | (5,345) | (1,991)
Income (loss) from continuing operations, before income taxes and equity in income of investees | 40,025 | 33,446 | 45,039 | 52,220 | 36,683 | 29,047 | 33,967 | 41,391 | 170,730 | 141,088 | 113,599
Income tax (provision) benefit | 29,669 | (11,003) | (6,369) | (10,886) | (2,450) | (11,988) | (7,890) | (9,509) | 1,411 | (31,837) | 15,258
Equity in income (losses) of investees | (267) | 337 | (428) | (1,599) | (3,001) | (2,653) | (1,144) | (937) | (1,957) | (7,735) | (5,508)
Net income (loss) | 69,427 | 22,780 | 38,242 | 39,735 | 31,232 | 14,406 | 24,933 | 30,945 | 170,184 | 101,516 | 123,349
Net loss (income) attributable to noncontrolling interest | (3,467) | (3,599) | (3,206) | (4,423) | (3,002) | (2,326) | (584) | (1,674) | 14,695 | 7,586 | 3,776
Net income (loss) attributable to the Company's stockholders | $ 65,960 | $ 19,181 | $ 35,036 | $ 35,312 | $ 28,230 | $ 12,080 | $ 24,349 | $ 29,271 | $ 155,489 | $ 93,930 | $ 119,573
Net income (in dollars per share) | $ 1.30 | $ 0.38 | $ 0.70 | $ 0.71 | $ 0.57 | $ 0.24 | $ 0.49 | $ 0.60 | $ 3.10 | $ 1.90 | $ 2.46
Net income (in dollars per share) | $ 1.29 | $ 0.38 | $ 0.69 | $ 0.70 | $ 0.56 | $ 0.21 | $ 0.48 | $ 0.59 | $ 3.06 | $ 1.87 | $ 2.43
Basic (in shares) | 50,607 | 50,367 | 49,771 | 49,680 | 49,647 | 49,599 | 49,456 | 49,173 | 50,110 | 49,469 | 48,562
Diluted (in shares) | 51,053 | 50,867 | 50,624 | 50,491 | 50,293 | 50,289 | 50,137 | 49,782 | 50,769 | 50,140 | 49,187

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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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