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Fair Value Measurements (Details) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Fair Value Measurements [Abstract]    
Fair value and carrying value of debt $ 11,000,000  
Fair Value Measurements [Abstract]    
Commodity risk management assets   14,000
Available for sale securities 45,000 69,000
Total assets 45,000 83,000
Commodity risk management liability 439,000 280,000
Other accrued liabilities 718,000 [1] 741,000 [1]
Total 1,157,000 1,021,000
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
    
Fair Value Measurements [Abstract]    
Commodity risk management assets   0
Available for sale securities 45,000 69,000
Total assets 45,000 69,000
Commodity risk management liability 0 0
Other accrued liabilities 0 [1] 0 [1]
Total 0 0
Significant Other Observable Inputs (Level 2) [Member]
    
Fair Value Measurements [Abstract]    
Commodity risk management assets   14,000
Available for sale securities 0 0
Total assets 0 14,000
Commodity risk management liability 439,000 280,000
Other accrued liabilities 0 [1] 0 [1]
Total 439,000 280,000
Significant Unobservable Inputs (Level 3) [Member]
    
Fair Value Measurements [Abstract]    
Commodity risk management assets   0
Available for sale securities 0 0
Total assets 0 0
Commodity risk management liability 0 0
Other accrued liabilities 718,000 [1] 741,000 [1]
Total $ 718,000 $ 741,000
[1] Other accrued liabilities represents the Company’s estimated liability for its executive retirement program.