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Income Taxes (Schedule Of Components Of The Net Deferred Tax Liability) (Details) (USD $) | Dec. 31, 2012 | Dec. 31, 2011
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Income Taxes [Abstract] |  |
Vacation Disallowance | $ 26,000 | $ 24,000
Allowance for Doubtful Accounts | 4,000 | 4,000
State Carryforward R&D Credit | 0 | 3,000
Total Deferred Tax Assets | 30,000 | 31,000
Prepaid Expenses | 23,000 | 26,000
Depreciation | 100,000 | 60,000
Net Unrealized Gain on Investments | 1,362,000 | 1,170,000
Total Deferred Tax Liabilities | 1,485,000 | 1,256,000
Net Deferred Tax Liability | $ (1,455,000) | $ (1,225,000)

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