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Note 17 - Subsequent Events (Details Textual) - USD ($) $ / shares in Units, $ in Millions |  |  | 1 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Oct. 01, 2020 | Jul. 01, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2020
Accelerated Share Repurchases, Initial Price, Shares (in shares) |  |  |  |  | 1,076,565
Share-based Payment Arrangement, Tranche Two [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period (Year) |  | 1 year |  |  |
Subsequent Event [Member] | Share-based Payment Arrangement, Tranche Two [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period (Year) | 1 year |  |  |  |
June 2020 Share Repurchase Program [Member] |  |  |  |  |
Accelerated Share Repurchases, Purchase Price |  |  | $ 50 | $ 50 |
Accelerated Share Repurchases, Initial Price, Shares (in shares) |  |  | 41,272 |  |
Accelerated Share Repurchases, Initial Price Paid Per Share (in dollars per share) |  | $ 170.20 |  |  |
June 2020 Share Repurchase Program [Member] | Subsequent Event [Member] |  |  |  |  |
Accelerated Share Repurchases, Initial Price, Shares (in shares) | 215,855 |  |  |  |
Accelerated Share Repurchases, Initial Price Paid Per Share (in dollars per share) | $ 185.31 |  |  |  |
Accelerated Share Repurchases, Settlement (Payment) or Receipt | $ 40 |  |  |  |

X
- 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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X
- 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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X
- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares at initial price for accelerated share repurchases. + References No definition available. + Details
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- Definition The purchase price of accelerated share repurchases. + References No definition available. + Details
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- Details
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