Income Taxes (Schedule Of Net Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Abstract]
Vacation Accrual	$ 23	$ 37
Allowance for Doubtful Accounts	2	3
Stock Compensation	88	128
Bonus	2	0
Depreciation and Amortization	17	0
Net Unrealized Loss on Investments	0	17
State Carryforward R&D Credit	101	73
Valuation allowance	(28)	0
Total Deferred Tax Assets	205	258
Prepaid Expenses	20	40
Depreciation and Amortization	0	20
Net unrealized gain on investment	3	0
Total Deferred Tax Liabilities	23	60
Net Deferred Tax Asset	$ 182	$ 198