Long-Term Debt (Narrative) (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended
	Mar. 06, 2013	Sep. 12, 2012	Mar. 14, 2012	Dec. 31, 2012	Dec. 31, 2011
Maximum [Member]
Line of Credit Facility [Line Items]
Interest rate per annum				8.25%
Minimum [Member]
Line of Credit Facility [Line Items]
Interest rate per annum				5.50%
F&M Bank [Member]
Line of Credit Facility [Line Items]
Maximum line of credit	$ 40			$ 40
Borrowing base	21.5	23.0	20.0	21.5
Increased borrowing base			23
Decreased borrowing base	20.50	21.50
Interest rate per annum				5.25%
Loans and letters of credit amount outstanding	$ 9.1			$ 10.1	$ 11.5
F&M Bank [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Interest rate per annum	5.25%		5.25%
F&M Bank [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Rate above prime	0.25%		0.25%