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Note 9 - Segment Information (Details) - Summary of Business by Segment (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Total Revenues	$ 82,197	$ 92,165
Segment gross margins	9,602	21,381
Income before interest and taxes	7,451	18,950
Interest and other income	2,551	1,212
Interest and other expense	(6)	(6)
Provision for income taxes	(3,722)	(6,106)
Net income	6,274	14,050
Operating Segments [Member] | Chemicals [Member]
Segment Reporting Information [Line Items]
Total Revenues	30,276	40,136
Segment gross margins	9,034	13,066
Operating Segments [Member] | Biofuels [Member]
Segment Reporting Information [Line Items]
Total Revenues	51,921	52,029
Segment gross margins	568	8,315
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Corporate expenses	$ (2,151)	$ (2,431)

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