Note 3 - Stock-based Compensation - Summary of Non-vested Restricted Stock Units (Details) - Performance-based Restricted Stock Units [Member] shares in Thousands	Sep. 23, 2023 $ / shares shares
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	$ 89.70
August 2022 Issuance [Member]
Total number of units outstanding (in shares) | shares	11
Grant date fair value per unit (in dollars per share) | $ / shares	$ 89.70
September 2022 [Member]
Total number of units outstanding (in shares) | shares	19
Grant date fair value per unit (in dollars per share) | $ / shares	$ 89.70
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