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Segment Reporting (Tables)

6 Months Ended

Jul. 31, 2013

Segment Reporting [Abstract]

Schedule of Segment Reporting Information Profit Loss And Revenue Percentage [Table Text Block]

The following table summarizes segment and other results and assets (amounts in thousands):

			Three Months Ended July 31,								Six Months Ended July 31,
			2013				2012				2013				2012
Net sales and revenue:
Alternative energy		$	175,290			$	152,778			$	353,614			$	303,442
Real estate			427				386				850				729
Total net sales and revenues		$	175,717			$	153,164			$	354,464			$	304,171

Segment gross profit (loss):
Alternative energy		$	10,890			$	7,027			$	19,916			$	12,537
Real estate			115				(69	)			195				(81	)
Total gross profit		$	11,005			$	6,958			$	20,111			$	12,456

			Three Months Ended July 31,								Six Months Ended July 31,
			2013				2012				2013				2012
Segment profit (loss):
Alternative energy		$	11,114			$	2,432			$	17,740			$	4,901
Real estate			53				(114	)			72				(216	)
Corporate expense			(732	)			(623	)			(1,432	)			(1,131	)
Interest expense			(8	)			(21	)			(17	)			(23	)
Interest income			18				19				36				49
Income from continuing operations before income taxes and noncontrolling interests		$	10,445			$	1,693			$	16,399			$	3,580

			Three Months Ended July 31,								Six Months Ended July 31,
			2013				2012				2013				2012
Sales of products alternative energy segment:
Ethanol			76	%			76	%			75	%			77	%
Distillers grains			21	%			21	%			22	%			20	%
Other			3	%			3	%			3	%			3	%
Total			100	%			100	%			100	%			100	%

Sales of services real estate segment:
Lease revenue			100	%			100	%			100	%			100	%

Schedule of Segment Reporting Information Assets [Table Text Block]

			July 31, 2013				January 31, 2013
Assets:
Alternative energy		$	346,313			$	337,857
Real estate			12,422				13,326
Corporate			49,967				54,147
Total assets		$	408,702			$	405,330