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Long-Term Debt (Schedule of Long-term Debt Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
F&M Bank [Member]
Dec. 31, 2012
Maximum [Member]
Mar. 06, 2013
Maximum [Member]
F&M Bank [Member]
Mar. 14, 2012
Maximum [Member]
F&M Bank [Member]
Dec. 31, 2012
Minimum [Member]
Line of Credit Facility [Line Items]              
Note payable to financial institution, with interest only payment until maturity $ 10,138 $ 11,531          
Installment notes bearing interest at the rate of 5.5% to 8.25% per annum collateralized by vehicles with monthly payments including interest, insurance and maintenance of approximately $20,000 208 266          
Total long-term debt 10,346 11,797          
Less current maturities (100) (103)          
Long-term debt, less current maturities 10,246 11,694          
Interest rate per annum     5.25% 8.25% 5.25% 5.25% 5.50%
Debt Instrument, Periodic Payments Including Insurance And Maintenance $ 20,000