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Note 3 - Stock-based Compensation - Summary of Non-vested Restricted Stock Units (Details) - Performance-based Restricted Stock Units [Member] | Dec. 24, 2022 $ / 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
April 2020 [Member] |
Total number of units outstanding (in shares) | shares | 2
Grant date fair value per unit (in dollars per share) | $ / shares | $ 26.25
July 2020 [Member] |
Total number of units outstanding (in shares) | shares | 26
Grant date fair value per unit (in dollars per share) | $ / shares | $ 27.08
September 2020, First Issuance [Member] |
Total number of units outstanding (in shares) | shares | 4
Grant date fair value per unit (in dollars per share) | $ / shares | $ 28.54
September 2020, Second Issuance [Member] |
Total number of units outstanding (in shares) | shares | 5
Grant date fair value per unit (in dollars per share) | $ / shares | $ 29.76
September 2020, Third Issuance [Member] |
Total number of units outstanding (in shares) | shares | 3
Grant date fair value per unit (in dollars per share) | $ / shares | $ 29.76
January 2021 [Member] |
Total number of units outstanding (in shares) | shares | 1
Grant date fair value per unit (in dollars per share) | $ / shares | $ 34.62
May 2021 [Member] |
Total number of units outstanding (in shares) | shares | 1
Grant date fair value per unit (in dollars per share) | $ / shares | $ 54.21
June 2021, First Issuance [Member] |
Total number of units outstanding (in shares) | shares | 10
Grant date fair value per unit (in dollars per share) | $ / shares | $ 53.17
June 2021, Second 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 2021, First Issuance [Member] |
Total number of units outstanding (in shares) | shares | 4
Grant date fair value per unit (in dollars per share) | $ / shares | $ 67.76
December 2021 [Member] |
Total number of units outstanding (in shares) | shares | 1
Grant date fair value per unit (in dollars per share) | $ / shares | $ 90.41
January 2022 [Member] |
Total number of units outstanding (in shares) | shares | 2
Grant date fair value per unit (in dollars per share) | $ / shares | $ 90.92
March 2022 [Member] |
Total number of units outstanding (in shares) | shares | 2
Grant date fair value per unit (in dollars per share) | $ / shares | $ 76.31
May 2022, First Issuance [Member] |
Total number of units outstanding (in shares) | shares | 12
Grant date fair value per unit (in dollars per share) | $ / shares | $ 63.17
May 2022, Second Issuance [Member] |
Total number of units outstanding (in shares) | shares | 11
Grant date fair value per unit (in dollars per share) | $ / shares | $ 63.17
August 2022 Issuance [Member] |
Total number of units outstanding (in shares) | shares | 1
Grant date fair value per unit (in dollars per share) | $ / shares | $ 78.04
December 2022 First Issuance [Member] |
Total number of units outstanding (in shares) | shares | 1
Grant date fair value per unit (in dollars per share) | $ / shares | $ 81.26
December 2022 Second Issuance [Member] |
Total number of units outstanding (in shares) | shares | 1
Grant date fair value per unit (in dollars per share) | $ / shares | $ 67.48
September 2022 First Issuance [Member] |
Total number of units outstanding (in shares) | shares | 5
Grant date fair value per unit (in dollars per share) | $ / shares | $ 73.80

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