Note 15 - Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 25, 2021
Total accumulated other comprehensive loss	$ (40,012)	$ (27,262)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated net currency translation adjustments	(46,308)	(25,833)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated net adjustments related to postretirement benefits	7,031	1,153
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Accumulated net unrealized gain/loss on investments	(735)	(67)
AOCI, Accumulated Reclassification, Sale of Business [Member]
Accumulated reclassification due to sale of PBC Test Business	0	(2,515)
AOCI Attributable to Parent [Member]
Total accumulated other comprehensive loss	$ (40,012)	$ (27,262)