Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Income tax provision
Net operating loss carryforwards	4,183,000	4,585,000
Deferred tax assets, valuation allowance	$ 1,171,000	1,926,000
Future federal tax rate	21.00%
Decrease in valuation allowance	$ 586,000
Unrecognized tax benefits
Change in unrecognized tax benefits during the period
Accrual for uncertain tax positions
Interest and penalties from tax examinations recognized in the statement of operations
Interest and penalties from tax examinations recognized on the balance sheet
Minimum [Member]
Operating Loss Carryforwards [Line Items]
Tax years open for examination	2013
Maximum [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, expiration date	Dec. 31, 2032
Tax years open for examination	2017