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Note 11 - Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2025
Notes Tables |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | September 30, |  | December 31,
|  | 2025 |  | 2024 |
Dividend yield |  |  | 2.79 | % |  |  | 2.57 | %
Expected volatility |  |  | 38.45 | % |  |  | 29.55 | %
Risk-free interest rate |  |  | 3.98 | % |  |  | 3.82 | %
Expected term in years |  |  | 6.2 |  |  |  | 6.3 |
Weighted-average grant date fair value per option granted |  | $ | 13.21 |  |  | $ | 11.36 |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Shares |  |  | Weighted-Average Exercise Price |  |  | Weighted-Average Remaining Contractual Term In Years |  |  | Aggregate Value |
Outstanding at January 1, 2025 |  |  | 537,901 |  |  | $ | 31.55 |  |  |  | 6.75 |  |  | $ | 5,187,207 |
Granted |  |  | 138,372 |  |  |  | 40.14 |  |  |  | 9.87 |  |  |  | — |
Less exercised |  |  | (6,000 | ) |  |  | 29.30 |  |  |  | — |  |  |  | 80,460 |
Outstanding at September 30, 2025 |  |  | 670,273 |  |  | $ | 33.34 |  |  |  | 6.83 |  |  | $ | 4,595,894 |
Expected to vest, assuming a 0.31% annual forfeiture rate at, September 30, 2025 (1) |  |  | 652,718 |  |  | $ | 33.21 |  |  |  | 6.77 |  |  |  | 4,555,924 |
Exercisable at September 30, 2025 |  |  | 383,098 |  |  | $ | 30.15 |  |  |  | 5.35 |  |  | $ | 3,789,646 |
Nonvested Restricted Stock Shares Activity [Table Text Block] |
Nonvested Shares |  | Shares |  |  | Weighted-Average Grant-Date Fair Value Per Share |
Nonvested at January 1, 2025 |  |  | 103,063 |  |  | $ | 35.05 |
Granted |  |  | 37,872 |  |  |  | 40.14 |
Less vested |  |  | (37,964 | ) |  |  | 30.75 |
Nonvested at September 30, 2025 |  |  | 102,971 |  |  | $ | 37.73 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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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 + Details
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