Note 1. Nature of Business and Significant Accounting Policies - Option Pricing Model Valuation Assumptions (Details) - $ / shares	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Expected life of purchase grants	10 years
Weighted average fair value per option granted (in dollars per share)	$ 18.61	$ 16.36	$ 13.97
Employee Stock Option
Dividend yield	0.42%	0.45%
Expected volatility	24.96%	22.31%
Risk-free interest rate	4.18%	4.22%
Expected life of purchase grants	6 years 3 months	6 years 3 months	6 years 3 months
Weighted average fair value per option granted (in dollars per share)	$ 18.61	$ 16.36
Employee Stock Option \| Minimum
Dividend yield			0.43%
Expected volatility			22.65%
Risk-free interest rate			1.87%
Weighted average fair value per option granted (in dollars per share)			$ 13.94
Employee Stock Option \| Maximum
Dividend yield			0.45%
Expected volatility			23.52%
Risk-free interest rate			3.12%
Weighted average fair value per option granted (in dollars per share)			$ 15.09
Stock Purchase Grants
Dividend yield	0.41%
Weighted average fair value per option granted (in dollars per share)	$ 11.85	$ 8.35	$ 7.88
Stock Purchase Grants \| Minimum
Dividend yield		0.48%	0.43%
Expected volatility	32.06%	15.86%	17.97%
Risk-free interest rate	3.94%	4.67%	0.14%
Expected life of purchase grants	3 months	3 months	3 months
Stock Purchase Grants \| Maximum
Dividend yield		0.58%	0.44%
Expected volatility	32.47%	29.69%	21.16%
Risk-free interest rate	5.16%	5.47%	2.24%
Expected life of purchase grants	6 months	6 months	6 months

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(ii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iv)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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