Note 7 - Derivative Financial Instruments - Foreign Currency Forward Contracts Outstanding (Details) - Dec. 25, 2021 - Not Designated as Hedging Instrument [Member] € in Thousands, SFr in Thousands, $ in Millions	USD ($)	EUR (€)	CHF (SFr)
Euro Foreign Exchange Forward [Member] | Long [Member]
Contract amount	$ 34.2	€ 30,185
Swiss Franc Foreign Exchange Forward [Member] | Long [Member]
Contract amount	20.8		SFr 19,086
Foreign Exchange Forward [Member]
Contract amount	$ 55.0