Annual report pursuant to Section 13 and 15(d)

Fair Value (Details Textual)

v2.4.0.8
Fair Value (Details Textual) (USD $)
Share data in Millions, unless otherwise specified
 1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended
Dec. 31, 2012
Nov. 30, 2012
Dec. 31, 2013
Nov. 30, 2012
Nov. 30, 2011
Nov. 30, 2011
High Sierra Energy [Member]
Aug. 31, 2012
High Sierra Energy [Member]
Dec. 31, 2012
Lightfoot Capital Partners LP [Member]
Dec. 31, 2012
Vantacore Partners LP [Member]
Schedule of Equity Method Investments [Line Items]                  
Proceeds from Sale of Available-for-sale Securities $ 49,000,000         $ 9,400,000      
Equity Method Investment, Ownership Percentage               6.70% 11.10%
Fair Value of Financial Instruments (Textual) [Abstract]                  
Consideration paid in newly issued units           1.2      
Trading Securities, Realized Gain (Loss) (6,432,269)   (251,213) 24,664 2,061,358   15,800,000    
Fair Value of Financial Instruments (Additional Textual) [Abstract]                  
Transfers between levels   0 0            
Minimum period for releasing of escrow receivable     14 months            
Remaining amount of escrow receivable     $ 699,000