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Note 15 - Share Repurchase Programs - Schedule of Share Repurchase Programs (Details) - $ / shares | 3 Months Ended | 36 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022
Treasury Stock, Number of Shares Purchased (in shares) |  | 11,014,201 | [1] | 6,691,421 | [1] | 83,300,000
Treasury Stock, Average Price per Share (in dollars per share) | [1],[2] | $ 249.95 |  | $ 209.50 |  |
[1] | Includes 7,012,232 shares repurchased in February 2022 under accelerated share repurchase programs.
[2] | In the period of the final settlement, the average price paid under the accelerated share repurchase programs is calculated based on the total program value less the value assigned to the initial delivery of shares. The average price of the initial settlement of the 2022 accelerated share repurchase programs was $250.99.

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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644 Reference 2: 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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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