Fair Value Measurements (Details) (USD $)	Jun. 30, 2013
Fair Value Measurements [Abstract]
Fair value and carrying value of debt	$ 19,700,000
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commodity risk management assets	220,000
Available for sale securities	82,000
Total assets	302,000
Commodity risk management liability	36,000
Other accrued liabilities	734,000
Total	770,000
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commodity risk management assets	0
Available for sale securities	82,000
Total assets	82,000
Commodity risk management liability	0
Other accrued liabilities	0
Total	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commodity risk management assets	220,000
Available for sale securities	0
Total assets	220,000
Commodity risk management liability	36,000
Other accrued liabilities	0
Total	36,000
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commodity risk management assets	0
Available for sale securities	0
Total assets	0
Commodity risk management liability	0
Other accrued liabilities	734,000
Total	$ 734,000