Stock Plans (Schedule of Compensation Cost for Share-Based Payment Arrangements, Allocation of Share-Based Compensation Costs by Plan) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Non-Vested Equity Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 1,106	$ 1,201	$ 958
Non-Vested Equity Awards [Member] | Director Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	422	434	240
Non-Vested Equity Awards [Member] | Omnibus Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	640	740	611
Non-Vested Equity Awards [Member] | Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	44	27	107
Restricted Stock And Stock-Settled Stock Appreciation Rights [Member] | Omnibus Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued stock-based compensation expense	$ (10)	$ (100)	$ (100)