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Income Taxes (Schedule Of Net Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Income Taxes [Abstract] |  |
Vacation Accrual | $ 37 | $ 34
Allowance for Doubtful Accounts | 3 | 3
Stock Compensation | 128 | 102
Bonus | 0 | 10
Depreciation And Amortization Deferred Tax Asset | 0 | 1
Net Unrealized Loss on Investments | 17 | 21
State Carryforward R&D Credit | 73 | 46
Total Deferred Tax Assets | 258 | 217
Prepaid Expenses | 40 | 33
Depreciation and Amortization Deferred Tax Liability | 20 | 0
Total Deferred Tax Liabilities | 60 | 33
Net Deferred Tax Asset | $ 198 | $ 184

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