Stock Compensation (Schedule Of Stock Grant Activity For RSUs) (Details) - Restricted Stock Units (RSUs) [Member] - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested, Beginning Balance, Shares	212,000	226,000	251,000
Granted, Shares	144,000	141,000	103,000
Vested, Shares	(93,000)	(118,000)	(101,000)
Forfeited, Shares	(39,000)	(37,000)	(27,000)
Unvested, Ending Balance, Shares	224,000	212,000	226,000	251,000
Vested and expected to vest, Shares	224,000
Outstanding, Weighted Average Remaining Contractual Term in Years	11 months 8 days	1 year 7 days	11 months 4 days	1 year 18 days
Vested and expected to vest, Weighted Average Remaining Contractual Term in Years	11 months 8 days
Outstanding, Aggregate Intrinsic Value	$ 4,558,000	$ 5,015,000	$ 6,131,000	$ 7,123,000
Vested and expected to vest, Aggregate Intrinsic Value	$ 4,558,000