Note 12 - Equity Compensation Plans - Stock Options Granted Weighted Average Assumptions (Details) - $ / shares	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019
Expected volatility	18.41%	18.76%
Risk-free interest rate	1.53%	2.27%
Expected term in years (Year)	4 years 3 months 18 days	4 years 4 months 24 days
Dividend yield	0.71%	0.80%
Weighted average grant date fair value per stock option (in dollars per share)	$ 25.77	$ 24.09

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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