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Note 6 - Income Taxes - Net Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Unrealized loss on investments | $ 582 | $ 475
Federal and state tax credits |  | 294
Fixed assets | (370) | (185)
Other | 95 | 171
Total deferred tax asset | 307 | 755
Less valuation allowance | (582) | (475)
Net deferred tax asset | $ (275) |
Net deferred tax liability |  | $ 280

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