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Note 11 - Income Tax - Income Tax Rate Reconciliation (Details)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
U.S. federal statutory rate 21.00% 21.00% 21.00%
State taxes, net of federal tax benefit 3.20% 4.00% 4.20%
Meals and entertainment 0.00% 0.00% 0.10%
Tax credits (0.70%) (1.70%) (7.20%)
Return to provision adjustments 0.00% 0.70% 0.00%
Foreign rate differential (3.70%) 0.00% 0.00%
GILTI impact 0.80% 0.00% 0.00%
Excess tax benefits on equity awards 0.00% 0.00% (1.20%)
Excess compensation 0.80% 0.70% 0.80%
Other 0.70% (0.60%) (0.20%)
Change in valuation allowance 0.00% 0.20% 0.00%
Effective tax rate 20.70% 25.10% 17.90%