Domestic And Foreign Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Change in valuation allowance	$ (440,000)	$ (3,384,000)	$ 5,846,000
Unrecognized tax benefits	0	0	$ 0
Income Tax Examination, Penalties and Interest Accrued	0	$ 0
United States IRS [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward	30,871,000
State [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward	$ 6,031,000