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Note 18 - Share-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Expected volatility |  |  | 34 - 35 | % |  |  | 27 - 32 | % |  |  | 26 - 27 | %
Weighted-average expected volatility |  |  | 35 | % |  |  | 27 | % |  |  | 26 | %
Expected dividend yield |  |  | 1.3 - 1.4 | % |  |  | 1.3 | % |  |  | 1.2 - 1.4 | %
Weighted-average expected dividend yield |  |  | 1.4 | % |  |  | 1.3 | % |  |  | 1.2 | %
Expected term, in years |  |  | 5 |  |  |  | 5 |  |  |  | 5 |
Risk-free interest rate |  |  | 0.8 - 0.9 | % |  |  | 0.3 - 1.3 | % |  |  | 1.6 - 2.5 | %
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Shares |  |  | Weighted-Average Exercise Price |
Outstanding at beginning of year |  |  | 990,663 |  |  | $ | 62.90 |
Granted |  |  | 73,274 |  |  |  | 79.14 |
Exercised |  |  | (147,890 | ) |  |  | 51.88 |
Forfeited |  |  | (5,912 | ) |  |  | 64.42 |
Expired |  |  | (863 | ) |  |  | 73.72 |
Outstanding at end of year |  |  | 909,272 |  |  | $ | 65.98 |
Exercisable at end of year |  |  | 743,371 |  |  | $ | 64.03 |
Nonvested Restricted Stock Shares Activity [Table Text Block] |
|  | Shares |  |  | Weighted-Average Grant Date Fair Value |
Nonvested at beginning of year |  |  | 94,043 |  |  | $ | 55.81 |
Granted |  |  | 16,863 |  |  |  | 79.34 |
Vested |  |  | (19,332 | ) |  |  | 59.81 |
Forfeited |  |  | — |  |  |  | — |
Nonvested at end of year |  |  | 91,574 |  |  | $ | 59.30 |
Schedule of Nonvested Performance-based Units Activity [Table Text Block] |
|  | Shares |  |  | Weighted-Average Grant Date Fair Value |
Nonvested at beginning of year |  |  | 124,219 |  |  | $ | 69.68 |
Granted |  |  | 57,195 |  |  |  | 78.39 |
Vested |  |  | (43,621 | ) |  |  | 67.88 |
Forfeited |  |  | (7,441 | ) |  |  | 72.25 |
Nonvested at end of year |  |  | 130,352 |  |  | $ | 73.96 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Shares |  |  | Weighted-Average Grant Date Fair Value |
Nonvested at beginning of year |  |  | 97,485 |  |  | $ | 64.95 |
Granted |  |  | 61,121 |  |  |  | 82.44 |
Vested |  |  | (54,752 | ) |  |  | 59.28 |
Forfeited |  |  | (12,883 | ) |  |  | 79.44 |
Nonvested at end of year |  |  | 90,971 |  |  | $ | 78.06 |

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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 http://asc.fasb.org/extlink&oid=120381028&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 http://asc.fasb.org/extlink&oid=120381028&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 http://asc.fasb.org/extlink&oid=120381028&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 http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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