Shareholders' Equity (Summary Of Activity Under Stock Option Plans) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Plan Shares Available for Grant, Balance	21	89,805
Plan Shares Available for Grant, Reserved	500,000	300,000
Plan Shares Available for Grant, Balance	99,685	21
Plan Options Outstanding, Balance	1,234,737	2,597,924
Plan Options Outstanding, Granted	737,500	416,450
Plan Options Outstanding, Exercised		(1,634,671)
Plan Options Outstanding, Balance	1,469,673	1,234,737
Weighted Average Exercise Price Per Share, Balance	$ 4.87	$ 3.55
Weighted Average Exercise Price Per Share, Granted	$ 1.67	$ 3.85
Weighted Average Exercise Price Per Share, Exercised		$ 2.31
Weighted Average Exercise Price Per Share, Balance	$ 3.03	$ 4.87
Aggregate Intrinsic Value, Exercised		$ 7,094,000
2003 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Plan Options Outstanding, Cancelled	(337,164)	(26,666)
Plan Options Outstanding, Balance	3,675,000
Weighted Average Exercise Price Per Share, Cancelled	$ 3.77	$ 4.82
1990 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Plan Options Outstanding, Cancelled	(165,400)	(118,300)
Plan Options Outstanding, Balance	3,175,000
Weighted Average Exercise Price Per Share, Cancelled	$ 9.19	$ 7.84