Note 17 - Employee Benefit Plans - Components of Pension Expense (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jul. 01, 2018	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017
Service cost	$ 0	$ 1	$ 2	$ 3
Interest cost on projected benefit obligation	325	371	658	759
Net amortizations, deferrals and other costs	148	163	316	346
Expected return on plan assets	(326)	(491)	(652)	(906)
Net periodic benefit cost	$ 147	$ 44	$ 324	$ 202

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

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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