Long-Term Debt (Narrative) (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended
	Mar. 14, 2012	Jun. 30, 2012	Dec. 31, 2011
Line of Credit Facility [Line Items]
Credit facility maturity date	Jan. 27, 2014
F&M Bank [Member]
Line of Credit Facility [Line Items]
Credit facility current borrowing capacity		$ 40
Borrowing base	20
Increased borrowing base	23
Interest rate per annum		5.25%
Loans and letters of credit amount outstanding		$ 13.9	$ 11.5
Maximum [Member]
Line of Credit Facility [Line Items]
Interest rate per annum		8.25%
Maximum [Member] | F&M Bank [Member]
Line of Credit Facility [Line Items]
Interest rate per annum	5.25%
Minimum [Member]
Line of Credit Facility [Line Items]
Interest rate per annum		5.50%
Minimum [Member] | F&M Bank [Member]
Line of Credit Facility [Line Items]
Rate above prime	0.25%