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Income Taxes (Schedule Of Net Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Income Taxes [Abstract] |  |
Vacation Accrual | $ 24 | $ 24
Allowance for Doubtful Accounts | 2 | 2
Stock Compensation | 93 | 91
Bonus | 2 | 0
Depreciation and Amortization | 50 | 29
Inventory Obsolescence | 4 | 2
R&D Credit Carryforward | 171 | 154
Valuation allowance | (121) | (81)
Total Deferred Tax Assets | 225 | 221
Prepaid Expenses | 22 | 20
Net unrealized gain on investments | 0 | 9
Total Deferred Tax Liabilities | 22 | 29
Net Deferred Tax Asset | $ 203 | $ 192

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