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Note 7 - Employee Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2018	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017
Foreign Plan [Member]
Service cost	$ 182	$ 397	$ 369	$ 780
Interest cost	1,318	1,378	2,671	2,712
Expected return on assets	(1,562)	(1,628)	(3,164)	(3,216)
Amortization of prior service costs	8	(9)	15	(16)
Recognized net actuarial (gains) / losses	281	320	569	629
Net periodic benefit cost	227	458	460	889
UNITED STATES | Salary Continuation Plan [Member]
Service cost	0	0	0	0
Interest cost	271	314	541	628
Amortization of prior service costs	0	0	0	0
Net periodic benefit cost	387	405	773	810
Amortization of (gain) / loss	$ 116	$ 91	$ 232	$ 182

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Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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