Notes Payable and Long-Term Debt (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	May 26, 2010	Mar. 19, 2009
Debt Instrument [Line Items]
Notional amount of interest rate						$ 9,000,000	$ 3,000,000
Long-term debt, basis spread on variable rate							3.40%
Interest rate, stated percentage							7.02%
Derivative, fixed interest rate						8.49%
Cash flow hedge, derivative instrument liabilities at fair value	1,437,000		1,437,000		1,196,000
Unrealized gain on interest rate swap	(244,000)	(103,000)	(159,000)	(55,000)	640,000
Collateral already posted, aggregate fair value	100,000		100,000		310,000
Available-for-sale securities pledged as collateral	1,335,000		1,335,000		877,000
Line of credit facility, maximum borrowing capacity	700,000		700,000
Line of credit facility, interest rate	5.00%		5.00%
Short-term notes payable	625,000		625,000		485,000
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Cash flow hedge, liability at fair value	469,000		469,000
Cash Flow Hedging [Member]
Debt Instrument [Line Items]
Cash flow hedge, liability at fair value	$ 968,000		$ 968,000