Note 3 - Stock-based Compensation - Summary of Non-vested Restricted Stock Units (Details) - Performance-based Restricted Stock Units [Member]	Dec. 24, 2022 $ / 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
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