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Note 17 - Income Taxes - Difference Between Statutory and Effective Tax Rates (Details)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
U.S. federal statutory income tax rate 35.00% 35.00%
Excess tax benefits from share-based compensation arrangements (7.10%)
Tax credits (5.50%) (9.70%)
Tax exempt interest income (1.10%) (1.30%)
Increase in cash surrender value of life insurance (1.30%) (0.80%)
State income taxes, net of federal benefit 0.70% 1.00%
Other, net 1.90% 3.00%
Effective income tax rate 22.60% 27.20%