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Note 22 - Subsequent Events (Details Textual) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 17, 2021 | Jan. 15, 2021 | Jan. 04, 2021 | Oct. 28, 2020 | Jul. 29, 2020 | Apr. 29, 2020 | Feb. 12, 2020 | Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Feb. 16, 2021
Accelerated Share Repurchases, Initial Price, Shares (in shares) |  |  |  |  |  |  |  |  | 1,339,462 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  |  |  |  | 936,843 | 920,398 | 958,332 |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  |  |  |  | 4 years |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  |  |  | $ 0.27 | $ 0.27 | $ 0.27 | $ 0.27 |  |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  |  |  |  | 163,441 | 167,231 | 207,041 |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  |  |  |  | 4 years |  |  |
Performance Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  |  |  |  | 50,736 | 51,792 | 46,705 |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  | 706,851 |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.29 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  | 134,840 |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Restricted Stock [Member] | Graded Vesting Service Period [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  | 4 years |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Performance Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  | 59,144 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  | 3 years |  |  |  |  |  |  |  |  |  |
December 2020 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Purchase Price |  |  |  |  |  |  |  | $ 50 |  |  |  |
Accelerated Share Repurchases, Initial Price, Shares (in shares) |  |  |  |  |  |  |  | 47,042 |  |  |  |
December 2020 Share Repurchase Program [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Initial Price, Shares (in shares) |  |  | 192,687 |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Initial Price Paid Per Share (in dollars per share) |  |  | $ 207.59 |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Settlement (Payment) or Receipt |  |  | $ 40 |  |  |  |  |  |  |  |  |
February 2021 Share Repurchase Program [Member] | Subsequent Event [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  |  | $ 300

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- Definition The price paid per share to immediately purchase the targeted number of shares on the date of executing the accelerated share repurchase agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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- Definition Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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