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Income Taxes (Schedule Of Net Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Income Taxes [Abstract] |  |
Vacation Accrual | $ 24 | $ 23
Allowance for Doubtful Accounts | 2 | 2
Stock Compensation | 91 | 88
Bonus | 0 | 2
Depreciation and Amortization | 29 | 17
Inventory Obsolescence | 2 | 0
R&D Credit Carryforward | 154 | 101
Valuation allowance | (81) | (28)
Total Deferred Tax Assets | 221 | 205
Prepaid Expenses | 20 | 20
Net unrealized gain on investments | 9 | 3
Total Deferred Tax Liabilities | 29 | 23
Net Deferred Tax Asset | $ 192 | $ 182

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