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Note 14 - Employee Benefit Plans - Net Periodic Benefit Cost Recognized in Consolidated Statements of Operations (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 05, 2020
Mar. 31, 2019
Selling, general and administrative expenses $ (1) $ (1)
Other expense (income), net (248) (162)
Total (249) (163)
Selling, General and Administrative Expenses [Member]    
Selling, general and administrative expenses $ (1) $ (1)