Note 6 - Employee Benefit Plans - Benefit Obligation, Fair Value of Plan Assets, Funded Status and Liability of Swiss Plan (Details) - Swiss Plan [Member] - USD ($) $ in Thousands	12 Months Ended
Dec. 27, 2025	Dec. 28, 2024	Dec. 30, 2023
Benefit obligation at beginning of year	$ (21,511)	$ (24,884)
Service cost	(603)	(643)	$ (551)
Interest cost	(244)	(357)	(510)
Actuarial gain (loss)	2,705	79
Participant contributions	(698)	(988)
Benefits paid	271	599
Plan change	(18)	203
Settlements	8,296	2,820
Plan Curtailment	1,496	0
Foreign currency exchange adjustment	(956)	1,660
Benefit obligation at end of year	(11,262)	(21,511)	(24,884)
Fair value of plan assets at beginning of year	17,458	19,700
Return on assets, net of actuarial loss	(203)	732
Employer contributions	639	783
Participant contributions	698	988
Benefits paid	(271)	(599)
Settlements	(8,296)	(2,820)
Foreign currency exchange adjustment	2,084	(1,326)
Fair value of plan assets at end of year	12,109	17,458	$ 19,700
Net liability at end of year	$ 847	$ (4,053)

Amount of the payment (recovery) to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, life insurance benefits, and legal, educational and advisory services.

No definition available.