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Note 1 - Nature of Business and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2024

Notes Tables

Fair value assumptions for stock option grants and stock purchase grants

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​	​	​	​	​	​	​	​	​	​	​
​		2024			2023			2022		​
Dividend yield	​	​	0.42%	​	​	0.45%	​	​	0.43% to 0.45%	​
Expected volatility		​	24.96%	​	​	22.31%	​	​	22.65% to 23.52%	​
Risk-free interest rate		​	4.18%	​	​	4.22%	​	​	1.87% to 3.12%	​
Expected life of option grants		​	6.25 years	​	​	6.25 years	​	​	6.25 years	​
Weighted-average grant date fair value	​	$	18.61	​	$	16.36	​	$	13.94 to 15.09	​

​

​	​	​	​	​	​	​	​	​	​	​
​		2024			2023			2022		​
Dividend yield	​		0.41%	​	​	0.48% to 0.58%	​	​	0.43% to 0.44%	​
Expected volatility	​		32.06% to 32.47%	​	​	15.86% to 29.69%	​	​	17.97% to 21.16%	​
Risk-free interest rate	​		3.94% to 5.16%	​	​	4.67% to 5.47%	​	​	0.14% to 2.24%	​
Expected life of purchase grants	​		3 to 6 months	​	​	3 to 6 months	​	​	3 to 6 months	​
Weighted-average grant date fair value	​	$	11.85	​	$	8.35	​	$	7.88	​

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- Definition

Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 718
-SubTopic 10
-Subparagraph (f)(2)
-Name Accounting Standards Codification
-Paragraph 2
-Section 50
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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- References

No definition available.

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