Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax [Line Items]
Tax computed at statutory rate	21.00%	35.00%	35.00%
Tax year audited	2015
Reclassification of certain tax effects from accumulated other comprehensive loss
Change in provisional tax benefit	$ 0
State [Member] | 2004 Through 2017 Tax Years [Member]
Income Tax [Line Items]
Net operating loss carryforwards	$ 27,600,000
Operating loss carryforwards, originated tax years	2004 through 2017
Net operating loss carryforwards, expiration date	Dec. 31, 2024
Federal And State [Member] | From 2011 Through 2017 Tax Years [Member]
Income Tax [Line Items]
Tax credit carryforwards	$ 2,100,000
Tax credit carryforwards, originated tax years	2011 through 2018 and
Minimum [Member] | Federal And State [Member] | From 2011 Through 2017 Tax Years [Member]
Income Tax [Line Items]
Tax credit carryforwards, expiration date	Dec. 31, 2021