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Note 7 - Income Taxes - Net Deferred Tax Assets (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Federal, state and foreign loss carryforwards |  | $ 794,000
Deferred revenue | 23,000 | 11,000
Federal and state tax credits | 294,000 | 757,000
Other | 438,000 | 402,000
Total deferred tax asset | 755,000 | 1,964,000
Less valuation allowance | (475,000) | (1,964,000)
Net deferred tax asset | $ 280,000 |

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