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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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