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Note N - Income Taxes - Deferred Tax Assets (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Allowance for doubtful accounts | $ 3,000 | $ 3,000
Warranty reserve | 29,000 | 20,000
Impaired Assets | 435,000 | 5,000
Inventory Reserve | 551,000 |
Capital Gains |  | 45,000
Deferred officers' compensation | 715,000 | 636,000
Depreciation and Amortization | 345,000 | 181,000
Deferred revenue |  | 478,000
Net operating loss carryforward | 16,500,000 | 15,116,000
Subtotal | 18,578,000 | 16,484,000
Valuation allowance | (18,578,000) | (16,484,000)
Non-current deferred tax asset |  |

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