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Note 16 - Employee Benefit Plans - Net Periodic Benefit Cost Recognized in Consolidated Statements of Operations (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Selling, general and administrative expenses $ 1,000 $ 0 $ 2,000 $ 2,000
Other (income), net   (322,000) (495,000)  
Total 334,000 147,000 497,000 324,000
Selling, General and Administrative Expenses [Member]        
Selling, general and administrative expenses 1,000 0 2,000 2,000
Other Nonoperating Income (Expense) [Member]        
Other (income), net $ 333,000 $ 147,000 $ 495,000 $ 322,000