Shareholders' Equity (Narrative) (Details) (USD $)	0 Months Ended		12 Months Ended					12 Months Ended			0 Months Ended
	Feb. 22, 2011	Feb. 23, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 1990 Plan [Member]	Dec. 31, 2012 2003 Plan [Member]	Dec. 31, 2011 Executive Officers And Employees [Member]	Dec. 31, 2012 Minimum [Member]	Feb. 22, 2011 Minimum [Member]	May 25, 2011 Maximum [Member]	May 23, 2011 Maximum [Member]	Feb. 22, 2011 Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation costs related to the outstanding stock options			$ 649,000
Total unrecognized compensation costs related to the outstanding stock options weighted average period of recognition			2 years 3 months 18 days
Common shares reserved for issuance			1,469,673	1,234,737	2,597,924	3,175,000	3,675,000
Exercise price at market value									100.00%
Weighted average remaining life of options outstanding			7 years 9 months 18 days
Aggregate intrinsic value of options outstanding			37,000
Weighted average remaining life of options exercisable			5 years 6 months
Aggregate intrinsic value of options exercisable			1,000
Weighted average grant-date fair value of options granted			$ 0.90	$ 2.12
Maximum percent of base compensation contributed towards purchase of shares			10.00%
Percent of market value for employee purchases			85.00%
Employees purchased shares			76,000	40,000
Shares are reserved for future employee purchases			236,000
Employee stock purchse plan compensation expense			33,000	42,000
Special dividend paid, per common share				$ 2.00
Special dividend of company stock price										25.00%
Repurchase of common stock, net	$ 17,562,000	$ 2,000,000	$ 213,000	$ 17,369,000				$ 1,590,000			$ 20,000,000	$ 15,000,000	$ 15,000,000
Repurchase of common stock, shares	3,877,000							738,000