Consolidated Condensed Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012	Oct. 31, 2011
Net sales and revenue	$ 178,950	$ 84,524	$ 483,122	$ 239,483
Cost of sales	175,303	75,506	467,015	225,960
Gross profit	3,647	9,018	16,107	13,523
Selling, general and administrative expenses	(2,995)	(2,344)	(9,190)	(6,616)
Equity in income of unconsolidated affiliates	1,542	6,284	1,503	15,827
Income from synthetic fuel investments				2,883
Interest income	42	92	132	364
Interest expense	(1,206)	(620)	(3,733)	(1,923)
Losses on derivative financial instruments, net	(140)	(501)	(366)	(1,190)
Income from continuing operations before income taxes	890	11,929	4,453	22,868
Provision for income taxes	(134)	(4,055)	(1,220)	(8,233)
Income from continuing operations	756	7,874	3,233	14,635
Income from discontinued operations, net of tax	107	186	361	856
Gain on disposal of discontinued operations, net of tax	30	267	80	425
Net income	893	8,327	3,674	15,916
Net income attributable to noncontrolling interests	(484)	(1,845)	(1,526)	(2,435)
Net income attributable to REX common shareholders	409	6,482	2,148	13,481
Weighted average shares outstanding – basic (in Shares)	8,226	9,205	8,311	9,385
Basic income per share from continuing operations attributable to REX common shareholders (in Dollars per share)	$ 0.03	$ 0.65	$ 0.21	$ 1.30
Basic income per share from discontinued operations attributable to REX common shareholders (in Dollars per share)	$ 0.01	$ 0.02	$ 0.04	$ 0.09
Basic income per share on disposal of discontinued operations attributable to REX common shareholders (in Dollars per share)	$ 0.01	$ 0.03	$ 0.01	$ 0.05
Basic net income per share attributable to REX common shareholders (in Dollars per share)	$ 0.05	$ 0.70	$ 0.26	$ 1.44
Weighted average shares outstanding – diluted (in Shares)	8,258	9,239	8,361	9,453
Diluted income per share from continuing operations attributable to REX common shareholders (in Dollars per share)	$ 0.03	$ 0.65	$ 0.21	$ 1.29
Diluted income per share from discontinued operations attributable to REX common shareholders (in Dollars per share)	$ 0.01	$ 0.02	$ 0.04	$ 0.09
Diluted income per share on disposal of discontinued operations attributable to REX common shareholders (in Dollars per share)	$ 0.01	$ 0.03	$ 0.01	$ 0.05
Diluted net income per share attributable to REX common shareholders (in Dollars per share)	$ 0.05	$ 0.70	$ 0.26	$ 1.43
Amounts attributable to REX common shareholders:
Income from continuing operations, net of tax	272	6,029	1,707	12,200
Income from discontinued operations, net of tax	137	453	441	1,281
Net income	$ 409	$ 6,482	$ 2,148	$ 13,481