Shareholders' Equity (Summary Of Stock Option Activity) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Shareholders' Equity [Abstract]
Number of Shares, outstanding - beginning of year	535,333		463,433		431,133
Number of Shares, Granted	159,750		156,000		85,000
Number of Shares, Exercised	(56,000)		(32,100)		(37,700)
Number of Shares, Forfeited or expired	(240,190)		(52,000)		(15,000)
Number of Shares, outstanding - end of period	398,893		535,333		463,433
Number of Shares, exercisable - end of period	160,143		249,333		213,058
Weighted Average Exercise Price per Share, outstanding - beginning of year	$ 9.58	[1]	$ 9.11	[1]	$ 8.10	[1]
Weighted Average Exercise Price per Share, Granted	$ 5.12	[1]	$ 10.21	[1]	$ 12.33	[1]
Weighted Average Exercise Price per Share, Exercised	$ 2.17	[1]	$ 3.29	[1]	$ 3.31	[1]
Weighted Average Exercise Price per Share, Forfeited or expired	$ 11.02	[1]	$ 11.16	[1]	$ 6.69	[1]
Weighted Average Exercise Price per Share, outstanding - end of period	$ 7.95	[1]	$ 9.58	[1]	$ 9.11	[1]
Weighted Average Exercise Price per Share, exercisable - end of period	$ 9.84	[1]	$ 8.81	[1]	$ 7.64	[1]

[1] Weighted Average Exercise Price