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Note 10 - Employee Benefits (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2023 |  |  | 2022 |  |  | 2021 |
Expected option life in years(1) |  |  | 6.0 |  |  |  | 6.0 |  |  |  | 6.0 |
Expected stock price volatility percentage(2) |  |  | 28 | % |  |  | 26 | % |  |  | 27 | %
Risk-free interest rate percentage(3) |  |  | 4.1 | % |  |  | 2.9 | % |  |  | 1.2 | %
Expected dividend yield(4) |  |  | 1.14 | % |  |  | 1.13 | % |  |  | 0.91 | %
Fair value as of the date of grant |  | $ | 6.63 |  |  | $ | 5.79 |  |  | $ | 4.29 |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Shares |  |  | Weighted- Average Exercise Price |
Outstanding at December 31, 2022 |  |  | 915,391 |  |  | $ | 15.84 |
Granted |  |  | 39,000 |  |  |  | 21.44 |
Exercised |  |  | (106,941 | ) |  |  | 11.30 |
Forfeited |  |  | (9,300 | ) |  |  | 18.35 |
Outstanding at December 31, 2023 |  |  | 838,150 |  |  | $ | 16.65 |
Exercisable at December 31, 2023 |  |  | 431,850 |  |  | $ | 15.12 |
Schedule of Nonvested Share Activity [Table Text Block] |
|  | Shares |  |  | Weighted- Average Grant Date Fair Value |  |  | Weighted- Average Remaining Contractual Life (in Years) |
Nonvested at December 31, 2022 |  |  | 544,150 |  |  | $ | 4.62 |  |  |  | 5.5 |
Granted |  |  | 39,000 |  |  |  | 6.63 |  |  |  | 6.6 |
Vested |  |  | (167,550 | ) |  |  | 4.44 |  |  |  | 3.9 |
Forfeited |  |  | (9,300 | ) |  |  | 5.01 |  |  |  | 5.2 |
Nonvested at December 31, 2023 |  |  | 406,300 |  |  | $ | 4.88 |  |  |  | 5.0 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Shares |  |  | Weighted-Average Grant Date Fair Value |
Nonvested at December 31, 2022 |  |  | 121,867 |  |  | $ | 17.83 |
Granted |  |  | 114,044 |  |  |  | 20.49 |
Vested |  |  | (47,511 | )(1) |  |  | 17.56 |
Nonvested at December 31, 2023 |  |  | 188,400 |  |  | $ | 19.51 |

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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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -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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