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Note 3 - Stock-based Compensation - Summary of Non-vested Restricted Stock Units (Details) - Performance-based Restricted Stock Units [Member] shares in Thousands | Dec. 23, 2023 $ / shares shares
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October 2018 [Member] |
Total number of units outstanding (in shares) | shares | 6
Grant date fair value per unit (in dollars per share) | $ / shares | $ 20.81
July 2020 [Member] |
Total number of units outstanding (in shares) | shares | 10
Grant date fair value per unit (in dollars per share) | $ / shares | $ 53.17
September 2020, First Issuance [Member] |
Total number of units outstanding (in shares) | shares | 11
Grant date fair value per unit (in dollars per share) | $ / shares | $ 53.17
September 2020, Second Issuance [Member] |
Total number of units outstanding (in shares) | shares | 4
Grant date fair value per unit (in dollars per share) | $ / shares | $ 67.76
September 2020, Third Issuance [Member] |
Total number of units outstanding (in shares) | shares | 1
Grant date fair value per unit (in dollars per share) | $ / shares | $ 90.92
June 2021, First Issuance [Member] |
Total number of units outstanding (in shares) | shares | 1
Grant date fair value per unit (in dollars per share) | $ / shares | $ 90.92
June 2021, Second Issuance [Member] |
Total number of units outstanding (in shares) | shares | 1
Grant date fair value per unit (in dollars per share) | $ / shares | $ 90.41
September 2021 [Member] |
Total number of units outstanding (in shares) | shares | 1
Grant date fair value per unit (in dollars per share) | $ / shares | $ 76.31
January 2022, First Issuance [Member] |
Total number of units outstanding (in shares) | shares | 11
Grant date fair value per unit (in dollars per share) | $ / shares | $ 63.17
January 2022, Second Issuance [Member] |
Total number of units outstanding (in shares) | shares | 12
Grant date fair value per unit (in dollars per share) | $ / shares | $ 63.17
January 2022, Third Issuance [Member] |
Total number of units outstanding (in shares) | shares | 1
Grant date fair value per unit (in dollars per share) | $ / shares | $ 78.04
March 2022 [Member] |
Total number of units outstanding (in shares) | shares | 1
Grant date fair value per unit (in dollars per share) | $ / shares | $ 81.26
May 2022, First Issuance [Member] |
Total number of units outstanding (in shares) | shares | 1
Grant date fair value per unit (in dollars per share) | $ / shares | $ 67.48
May 2022, Second Issuance [Member] |
Total number of units outstanding (in shares) | shares | 10
Grant date fair value per unit (in dollars per share) | $ / shares | $ 89.7
August 2022 Issuance [Member] |
Total number of units outstanding (in shares) | shares | 11
Grant date fair value per unit (in dollars per share) | $ / shares | $ 89.7
September 2022 [Member] |
Total number of units outstanding (in shares) | shares | 19
Grant date fair value per unit (in dollars per share) | $ / shares | $ 89.7
December 2022 First Issuance [Member] |
Total number of units outstanding (in shares) | shares | 6
Grant date fair value per unit (in dollars per share) | $ / shares | $ 90.56
December 2022 Second Issuance [Member] |
Total number of units outstanding (in shares) | shares | 4
Grant date fair value per unit (in dollars per share) | $ / shares | $ 109.55

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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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