Long Term Debt and Interest Rate Swaps (Details) (USD $)	6 Months Ended		6 Months Ended					6 Months Ended						3 Months Ended	6 Months Ended			6 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended		3 Months Ended	6 Months Ended				6 Months Ended
	Jul. 31, 2013	Jan. 31, 2013	Jul. 31, 2013 Interest Rate Swap One [Member] One Earth Energy [Member]	Jul. 31, 2009 Interest Rate Swap One [Member] One Earth Energy [Member]	Jul. 31, 2013 Interest Rate Swap [Member] One Earth Energy [Member]	Jan. 31, 2013 Interest Rate Swap [Member] One Earth Energy [Member]	Jul. 31, 2013 Interest Rate Swap [Member]	Jan. 31, 2008 One Earth Energy [Member] Construction Loans [Member]	Jul. 31, 2013 One Earth Energy [Member] Revolving Credit Facility [Member]	Jan. 31, 2008 One Earth Energy [Member] Revolving Credit Facility [Member]	Jan. 31, 2008 One Earth Energy [Member] Letter of Credit [Member]	Jul. 31, 2013 One Earth Energy [Member] Term Loan [Member]	Jan. 31, 2013 One Earth Energy [Member] Term Loan [Member]	Oct. 31, 2009 One Earth Energy [Member]	Jul. 31, 2013 One Earth Energy [Member]	Jan. 31, 2008 One Earth Energy [Member]	Jul. 31, 2013 One Earth Energy [Member] Minimum [Member] Term Loan [Member]	Jul. 31, 2013 One Earth Energy [Member] Minimum [Member]	Jul. 31, 2013 One Earth Energy [Member] Maximum [Member] Term Loan [Member]	Jul. 31, 2013 One Earth Energy [Member] Maximum [Member]	Jul. 31, 2013 First National Bank [Member]	Jan. 31, 2012 Nu Gen Energy [Member] Revolving Credit Facility [Member]	Jul. 31, 2013 Nu Gen Energy [Member] Revolving Credit Facility [Member]	Jan. 31, 2012 Nu Gen Energy [Member] Term Loan [Member]	Jul. 31, 2013 Nu Gen Energy [Member] Term Loan [Member]	Jan. 31, 2013 Nu Gen Energy [Member] Term Loan [Member]	Jan. 31, 2012 Nu Gen Energy [Member]	Jul. 31, 2013 Nu Gen Energy [Member]	Jan. 31, 2014 Nu Gen Energy [Member]	Oct. 31, 2013 Nu Gen Energy [Member]	Apr. 30, 2013 Nu Gen Energy [Member]	Jul. 31, 2013 Nu Gen Energy [Member] Minimum [Member]	Jul. 31, 2013 Nu Gen Energy [Member] Maximum [Member]
Long Term Debt and Interest Rate Swaps (Details) [Line Items]
Proceeds from Bank Debt								$ 100,000,000		$ 10,000,000	$ 1,000,000					$ 111,000,000						$ 10,000,000	$ 10,000,000	$ 55,000,000			$ 65,000,000
Debt Conversion, Original Debt, Type of Debt															The construction loan was converted into a term loan on July 31, 2009
Debt Instrument, Description of Variable Rate Basis												LIBOR plus 280 basis points to LIBOR plus 300 basis points													LIBOR plus 325 basis points
Debt Instrument, Interest Rate at Period End																	3.10%		3.30%
Debt Instrument, Frequency of Periodic Payment														19 quarterly payments														19 quarterly payments
Long Term Debt Principal Portion Amortization Schedule														120 months											120 months
Debt Instrument Refinanced Amount	44,101,000
Debt Instrument Refinanced Amount Interest Rate	LIBOR plus 300 basis points
Debt Instrument Unscheduled Principal Payments															2,100,000
Debt instrument prepaid principal payment															6,400,000
Long Term Debt Maturities First Repayments of Principal in Year Two															2,000,000
Long Term Debt Maturities Second Repayment of Principal in Year Two															2,100,000
Long-term Debt Maturities Principal Payment Due Beginning Date															Jan. 08, 2014
Long-term Debt Maturities Principal Payment Due Ending Date															Apr. 08, 2014
Long Term Debt Quarterly Principal Payments															2,000,000
Long-term Debt Maturities Quarterly Principal Payment Due Beginning Date															Jul. 08, 2014
Long-term Debt Maturities Quarterly Principal Payment Due Ending Date															Apr. 08, 2019
Debt Instrument Principal Payments as Percentage of Annual Excess Cash Flows												20.00%													40.00%
Debt Instrument, Annual Principal Payment												6,000,000													5,000,000
Debt Instrument Maximum Payment Aggregate															18,000,000
Long-term Debt, Gross												52,600,000													45,400,000
Fixed Charge Coverage Ratio																		1.00%		1.10%												1.00%	1.10%
Period Of Loan Agreement To Maintain Compliance With Covenants																					12 months
Payments of Financing Costs												1,400,000													600,000
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries												80,600,000	77,900,000												53,100,000	49,500,000
Line of Credit Facility, Amount Outstanding									0														0					500,000
Line of Credit Facility, Maximum Borrowing Capacity									10,000,000
Debt Instrument, Maturity Date									Jul. 31, 2014														May 31, 2014		Oct. 31, 2016
Derivative Liability, Notional Amount				50,000,000			35,668,000
Swap Termination Date			July 8, 2014
Debt Instrument, Basis Spread on Variable Rate			7.90%
Derivative Liability	1,933,000	2,789,000			1,900,000	2,800,000	1,933,000
Debt Instrument Libor Floor Rate																									4.00%
Minimum Working Capital Regarding Modification Of The Covenant																												$ 7,500,000	$ 10,000,000	$ 7,500,000	$ 7,500,000