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Note 9 - Segment information (Tables)

6 Months Ended

Jun. 30, 2013

Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]

Three Months Ended	United States		All Foreign Countries		Total
June 30, 2013	$	102,901	$	3,162	$	106,063
June 30, 2012	$	100,262	$	2,975	$	103,237

Six Months Ended	United States		All Foreign Countries		Total
June 30, 2013	$	190,879	$	7,349	$	198,228
June 30, 2012	$	181,406	$	7,558	$	188,964

Schedule of Segment Reporting Information, by Segment [Table Text Block]

	For the three months ended June 30,						For the six months ended June 30,
	2013			2012			2013			2012
Revenues
Chemicals	$	42,026		$	40,893		$	82,162		$	79,302
Biofuels		64,037			62,344			116,066			109,662
Revenues	$	106,063		$	103,237		$	198,228		$	188,964

Segment gross profit
Chemicals	$	14,784		$	11,249		$	27,850		$	22,918
Biofuels		12,842			3,151			21,157			4,283
Segment gross margins		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

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

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