Note 9 - Income Taxes - Reconciliation of Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 25, 2021	Dec. 26, 2020
Balance at beginning of year	$ 33,391	$ 33,696	$ 34,740
Additions for tax positions of current year	910	686	817
Reductions for tax positions of prior years	(428)	(83)	(425)
Reductions due to lapse of the statute of limitations	(354)	(1,012)	(304)
Reductions due to settlements	0	0	(1,134)
Foreign exchange rate impact	(151)
Foreign exchange rate impact		104	2
Balance at end of year	$ 33,368	$ 33,391	$ 33,696