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Note 9 - Segment information (Details) - Summary of Business by Segment (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Revenues |  |  |  |
Revenues | $ 106,063 | $ 103,237 | $ 198,228 | $ 188,964
Segment gross profit |  |  |  |
Gross Profit | 27,626 | 14,400 | 49,007 | 27,201
Corporate expenses | (2,651) | (2,828) | (5,082) | (5,046)
Income before interest and taxes | 24,975 | 11,572 | 43,925 | 22,155
Interest and other income | 3,719 | 1,243 | 4,931 | 2,529
Interest and other expense | (40) | (125) | (46) | (15)
Provision for income taxes | (10,498) | (4,217) | (16,604) | (9,083)
Net income | 18,156 | 8,473 | 32,206 | 15,586
Chemicals [Member] |  |  |  |
Revenues |  |  |  |
Revenues | 42,026 | 40,893 | 82,162 | 79,302
Segment gross profit |  |  |  |
Gross Profit | 14,784 | 11,249 | 27,850 | 22,918
Biofuels [Member] |  |  |  |
Revenues |  |  |  |
Revenues | 64,037 | 62,344 | 116,066 | 109,662
Segment gross profit |  |  |  |
Gross Profit | $ 12,842 | $ 3,151 | $ 21,157 | $ 4,283

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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + 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 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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