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Note 7 - Income Taxes - Summary of Valuation Allowance (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Valuation allowance at beginning of period $ 18,823 $ 13,867
Income tax benefit 6,873 4,956
Release of valuation allowance 0 0
Valuation allowance at end of period $ 25,696 $ 18,823