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Note 10 - Income Taxes - Net Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Net operating loss carry forwards $ 18,205 $ 10,988
Research and development tax credits 404 90
Stock based compensation and other 3,694 2,860
Operating lease obligation 1,339 1,789
Total deferred tax assets 23,642 15,727
Less: Valuation allowance (23,179) (15,106)
Operating lease right-of-use assets (463) (621)
Net deferred tax assets $ 0 $ 0