Notes Payable and Long-Term Debt (Narrative) (Details) (USD $)	0 Months Ended	12 Months Ended
	Mar. 19, 2009	Dec. 31, 2012	Dec. 31, 2011	Jan. 31, 2012	May 26, 2010	Dec. 31, 2012 Interest Rate Swap [Member]	Dec. 31, 2012 Cash Flow Hedging [Member]	Dec. 31, 2012 Promissory Notes [Member]	Jul. 31, 2012 Promissory Notes [Member]	Dec. 31, 2012 Line of Credit [Member]
Debt Instrument [Line Items]
Notional amount of interest rate	$ 3,000,000				$ 9,000,000
Description of variable rate basis	three-month LIBOR
Long-term debt, basis spread on variable rate	3.40%
Interest rate, stated percentage	7.02%								1.00%	4.50%
Debt Instrument, Interest Rate at Period End									5.25%	4.50%
Amount outstanding		125,000	485,000					10,500,000
Annual installments		1,167,000	0
Long-term debt		25,339,000	12,372,000
Derivative, fixed interest rate					8.49%
Cash flow hedge, liability at fair value						471,000	1,050,000
Cash flow hedge, derivative instrument liabilities at fair value		1,521,000	1,196,000
Drawns on line of credit		125,000	485,000
Unrealized loss on interest rate swap		214,000	640,000
Available-for-sale securities pledged as collateral		1,557,000	877,000
Collateral already posted, aggregate fair value			310,000
Line of credit facility, maximum borrowing capacity		$ 4,000,000		$ 700,000					$ 13,000,000
Line of credit facility, interest rate		5.00%