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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