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, 2019	Dec. 31, 2018	Dec. 31, 2017
Non-Vested Equity Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 958	$ 880	$ 333
Non-Vested Equity Awards [Member] | Director Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	240	237	116
Non-Vested Equity Awards [Member] | Omnibus Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	611	500	194
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	107	143	23
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	$ (100)	$ (100)	$ 200