Note 15 - Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Thousands	Dec. 25, 2021	Dec. 26, 2020
Total accumulated other comprehensive loss	$ (27,262)	$ (4,326)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated net currency translation adjustments	(25,833)	(2,877)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated net adjustments related to postretirement benefits	1,153	(1,449)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Accumulated net unrealized gain/loss on investments	(67)	0
AOCI, Accumulated Reclassification, Sale of Business [Member]
Accumulated reclassification due to sale of PBC Test Business	(2,515)	0
AOCI Attributable to Parent [Member]
Total accumulated other comprehensive loss	$ (27,262)	$ (4,326)