Income Taxes (Loss and Credit Carryforwards) (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Income before income taxes	$ 3,710,000	$ 2,119,000	$ 10,834,000
Unrecognized tax benefits	0		0
Operating Loss Carryforwards [Line Items]
Alternative minimum tax credits from all years	739,000
Federal | Expires 2030
Operating Loss Carryforwards [Line Items]
Net operating loss	291,000
State | Expires 2030
Operating Loss Carryforwards [Line Items]
Tax credits	203,000
State | Expires 2029
Operating Loss Carryforwards [Line Items]
Tax credits	57,000
State | Expires 2028
Operating Loss Carryforwards [Line Items]
Net operating loss	26,000
State | Expires 2031
Operating Loss Carryforwards [Line Items]
Tax credits	377,000
State | Expires 2032
Operating Loss Carryforwards [Line Items]
Tax credits	356,000
Mississippi | State
Operating Loss Carryforwards [Line Items]
Taxes payable as a result of audit			3,000
Mississippi | State | Expires 2030
Operating Loss Carryforwards [Line Items]
Net operating loss	4,707,000
Mississippi | State | Expires 2029
Operating Loss Carryforwards [Line Items]
Net operating loss	5,110,000
Alabama | State | Expires 2029
Operating Loss Carryforwards [Line Items]
Net operating loss	177,000
Tennessee | State | Expires 2030
Operating Loss Carryforwards [Line Items]
Net operating loss	93,000
Tennessee | State | Expires 2029
Operating Loss Carryforwards [Line Items]
Net operating loss	908,000
Florida | State | Expires 2030
Operating Loss Carryforwards [Line Items]
Net operating loss	20,000
Florida | State | Expires 2029
Operating Loss Carryforwards [Line Items]
Net operating loss	$ 511,000