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Note 10 - Income Taxes - Provision (Benefit) for Federal Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Federal $ 0 $ 0
State 0 0
Federal 0 0
State 0 0
Total deferred tax expense 0 0
Total income tax expense $ 0 $ 0