Income Taxes (Schedule Of Deferred Tax Assets And Valuation Allowance) (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Abstract]
Net Operating Loss Carryforwards	$ 41,184,000	$ 35,805,000
Stock Compensation Expense	1,608,000	1,458,000
Book tax differences on assets and liabilities	195,000	365,000
Valuation Allowance	(42,987,000)	(37,628,000)
Net Deferred Tax Assets