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Note 16 - Employee Benefit Plans - Components of Pension Expense (Benefit) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 05, 2020
Jun. 30, 2019
Jul. 05, 2020
Jun. 30, 2019
Service cost $ 1 $ 1 $ 2 $ 2
Interest cost on projected benefit obligation 190 375 542 704
Net amortizations, deferrals and other costs 149 175 316 333
Expected return on plan assets (185) (217) (456) (542)
Net periodic benefit cost $ 155 $ 334 $ 404 $ 497