Note 8 - Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands				12 Months Ended
	Mar. 11, 2021	Mar. 11, 2021	Mar. 08, 2021	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019	Oct. 28, 2021
Proceeds from Issuance of Common Stock				$ 223,119	$ 0	$ 0
Stock Repurchase Program, Authorized Amount							$ 70,000
Stock Repurchased During Period, Shares (in shares)				206,572
Stock Repurchased During Period, Value				$ 7,300
Stock Repurchase Program, Remaining Authorized Repurchase Amount				$ 62,700
Underwritten Public Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)			4,950,000
Shares Issued, Price Per Share (in dollars per share)			$ 41.00
Proceeds from Issuance of Common Stock		$ 223,100
Over-Allotment Option [Member]
Stock Issued During Period, Shares, New Issues (in shares)	742,500