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Financial Instruments (Details Textual) (USD $)	3 Months Ended
Financial Instruments (Details Textual) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Financial Instruments (Additional Textual) [Abstract]
Corporate and municipal bonds	$ 25,800,000	$ 28,200,000
Maturity dates of bonds, start date	2013-07
Maturity dates of bonds, end date	2018-01
Interest at a fixed rate	1.41%
Interest rate swap [Member]
Financial Instruments (Textual) [Abstract]
Notional value	40,000,000
Interest rate swap description	Interest that varies with the three-month LIBOR
June 2014 [Member] \| Interest rate swap [Member]
Financial Instruments (Textual) [Abstract]
Notional value	25,000,000
Interest rate swap expiration date	2014-06
June 2015 [Member] \| Interest rate swap [Member]
Financial Instruments (Textual) [Abstract]
Notional value	$ 15,000,000
Interest rate swap expiration date	2015-06