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Note 8 - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Federal income tax rate 21.00% 21.00%
Foreign rate differential 5.00% 5.60%
State tax, net of federal benefit 2.00% 1.20%
Share-based awards compensation, tax rate (2.20%) (3.50%)
Permanent items 0.30% (0.20%)
Provision to return 0.00% 3.30%
Other 1.00% 0.00%
Credits 1.20% 0.00%
Change in valuation allowance (28.30%) (27.40%)
Effective income tax rate 0.00% 0.00%