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Note N - Income Taxes - Deferred Tax Assets (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Allowance for doubtful accounts-short term | $ 3,000 | $ 4,000
Warranty reserve | 20,000 | 36,000
Capital Gains | 45,000 |
Deferred officers compensation | 636,000 | 395,000
Depreciation and Amortization | 181,000 | 135,000
Deferred revenue | 478,000 |
Net operating loss carryforward | 15,116,000 | 18,456,000
Subtotal | 16,479,000 | 19,026,000
Valuation allowance | $ (16,479,000) | $ (19,026,000)

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