Income Taxes (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Taxes [Line Items]
Provision or benefit for income taxes
Unrecognized tax benefits	0		0
Federal net operating loss carryforwards					$ 30,200,000
Deferred tax asset	$ 242,000		$ 242,000		$ 242,000
Minimum [Member]
Income Taxes [Line Items]
Federal net operating loss carryforwards expiration between, years			Dec. 31, 2019
Maximum [Member]
Income Taxes [Line Items]
Federal net operating loss carryforwards expiration between, years			Dec. 31, 2036