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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

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