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Note 7 - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Federal tax benefit at statutory rate | $ 6,096 | $ 3,338
Federal tax benefit at statutory rate, percentage | 21.00% | 21.00%
State tax benefit net of federal | $ 347 | $ 25
State tax benefit net of federal, percentage | 1.20% | 0.20%
Foreign rate differential | $ 10 | $ 7
Foreign rate differential, percentage | 0.00% | 0.00%
Stock warrant costs | $ 280 | $ 1,413
Stock warrant costs, percentage | 1.00% | 8.90%
Other permanent differences | $ (145) | $ (77)
Other permanent differences, percentage | (0.50%) | (0.50%)
Permanent provision to return items | $ 395 | $ 344
Permanent provision to return items, percentage | 1.40% | 2.20%
Stock compensation change | $ (49) | $ (37)
Stock compensation change, percentage | (0.20%) | (0.20%)
Uncertain tax provision | $ (61) | $ (57)
Uncertain tax provision, percentage | (0.20%) | (0.40%)
Increase in valuation allowance | $ (6,873) | $ (4,956)
Increase in valuation allowance, percentage | (23.70%) | (31.20%)
Total tax (expense) benefit | $ 0 | $ 0
Total tax (expense) benefit, percentage | 0.00% | 0.00%

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