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Note 6 - Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Current:    
Federal $ 0 $ 0
State 56 65
Deferred:    
Federal 0 0
State 0 0
Total provision for income taxes before valuation allowance 56 65
Change in valuation allowance 0 0
Total provision for income taxes $ 56 $ 65