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Note 11 - Employee Benefits (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2022 |  |  | 2021 |  |  | 2020 |
Expected option life in years(1) |  |  | 6.0 |  |  |  | 6.0 |  |  |  | 6.0 |
Expected stock price volatility percentage(2) |  |  | 26 | % |  |  | 27 | % |  |  | 28 | %
Risk-free interest rate percentage(3) |  |  | 2.9 | % |  |  | 1.2 | % |  |  | 0.6 | %
Expected dividend yield(4) |  |  | 1.13 | % |  |  | 0.91 | % |  |  | 0.80 | %
Fair value as of the date of grant |  | $ | 5.79 |  |  | $ | 4.29 |  |  | $ | 3.85 |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Shares |  |  | Weighted Average Exercise Price |
Outstanding at December 31, 2021 |  |  | 1,029,466 |  |  | $ | 14.00 |
Granted |  |  | 141,500 |  |  |  | 21.05 |
Exercised |  |  | (201,975 | ) |  |  | 9.89 |
Forfeited |  |  | (53,600 | ) |  |  | 16.61 |
Outstanding at December 31, 2022 |  |  | 915,391 |  |  | $ | 15.84 |
Exercisable at December 31, 2022 |  |  | 371,241 |  |  | $ | 13.38 |
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, 2021 |  |  | 631,051 |  |  | $ | 4.14 |  |  |  | 5.9 |
Granted |  |  | 141,500 |  |  |  | 5.79 |  |  |  | 6.6 |
Vested |  |  | (174,801 | ) |  |  | 3.95 |  |  |  | 4.0 |
Forfeited |  |  | (53,600 | ) |  |  | 4.27 |  |  |  | 5.3 |
Nonvested at December 31, 2022 |  |  | 544,150 |  |  | $ | 4.62 |  |  |  | 5.5 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Shares |  |  |  | Weighted Average Grant Date Fair Value |
Nonvested at December 31, 2021 |  |  | 132,126 |  |  |  | $ | 16.10 |
Granted |  |  | 123,900 |  |  |  |  | 18.79 |
Vested |  |  | (113,996 | ) | (1) |  |  | 17.13 |
Forfeited |  |  | (20,163 | ) |  |  |  | 16.13 |
Nonvested at December 31, 2022 |  |  | 121,867 |  |  |  | $ | 17.83 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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