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Note 6 - Income Taxes - Difference Between Statutory and Effective Tax Rates (Details)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
U.S. federal statutory income tax rate 21.00% 21.00%
State income taxes, net of federal benefit 3.20% (1.30%)
Tax credits (0.50%) (5.90%)
Excess tax benefit from stock-based compensation arrangements (3.00%) 0.40%
Change in cash surrender value of life insurance (0.40%) 1.20%
Tax exempt interest income (0.10%) (0.30%)
Other, net (0.80%) (0.60%)
Effective tax rate 19.40% 14.50%