Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments (Details Textual)

v2.4.0.6
Fair Value of Financial Instruments (Details Textual) (USD $)
Share data in Millions, unless otherwise specified
9 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Fair Value of Financial Instruments (Textual) [Abstract]    
Minimum period for releasing of escrow receivable 14 months  
Carrying value of escrow receivable reduced by $ 335,486  
Transfers between levels 0 0
High Sierra Energy [Member]
   
Fair Value of Financial Instruments (Textual) [Abstract]    
Consideration paid in cash for acquisition 9,400,000  
Consideration paid in newly issued units 1.2  
Gain realized during the quarter $ 15,800,000  
Vantacore partners LP [Member]
   
Fair Value of Financial Instruments (Textual) [Abstract]    
Percentage of equity interest 6.70%  
Public company comparable historical EBITDA multiples [Member] | Vantacore partners LP [Member]
   
Fair Value of Financial Instruments (Textual) [Abstract]    
Weighted average security investment 12.50%  
Public company comparable historical EBITDA multiples [Member] | Lighfoot capital partners LP [Member]
   
Fair Value of Financial Instruments (Textual) [Abstract]    
Weighted average security investment 20.00%  
Public company comparable projected EBITDA multiples [Member] | Vantacore partners LP [Member]
   
Fair Value of Financial Instruments (Textual) [Abstract]    
Weighted average security investment 12.50%  
Public company comparable projected EBITDA multiples [Member] | Lighfoot capital partners LP [Member]
   
Fair Value of Financial Instruments (Textual) [Abstract]    
Weighted average security investment 20.00%  
Historical EBITDA multiples for recent comparable industry transactions [Member] | Vantacore partners LP [Member]
   
Fair Value of Financial Instruments (Textual) [Abstract]    
Weighted average security investment 12.50%  
Historical EBITDA multiples for recent comparable industry transactions [Member] | Lighfoot capital partners LP [Member]
   
Fair Value of Financial Instruments (Textual) [Abstract]    
Weighted average security investment 20.00%  
Discounted cash flow analysis of EBITDA [Member] | Vantacore partners LP [Member]
   
Fair Value of Financial Instruments (Textual) [Abstract]    
Weighted average security investment 12.50%  
Discounted cash flow analysis of EBITDA [Member] | Lighfoot capital partners LP [Member]
   
Fair Value of Financial Instruments (Textual) [Abstract]    
Weighted average security investment 20.00%  
Distributable cash flows yield analysis [Member] | Lighfoot capital partners LP [Member]
   
Fair Value of Financial Instruments (Textual) [Abstract]    
Weighted average security investment 20.00%  
Recent capital transaction of company [Member] | Vantacore partners LP [Member]
   
Fair Value of Financial Instruments (Textual) [Abstract]    
Weighted average security investment 50.00%