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Note 5 - Revenue from Contracts with Customers 1 (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jul. 05, 2020
Jun. 30, 2019
Jul. 05, 2020
Jun. 30, 2019
Dec. 31, 2019
Revenue, Remaining Performance Obligation, Amount $ 29,074,000   $ 29,074,000    
Contract with Customer, Liability, Total         $ 7,504,000
Contract with Customer, Liability, Revenue Recognized 2,929,000 $ 2,190,000 4,645,000 $ 3,234,000  
Other Current Assets [Member]          
Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total 1,389,000   1,389,000   906,000
Accrued Liabilities [Member]          
Contract with Customer, Liability, Current $ 6,102,000   $ 6,102,000   5,769,000
Other Noncurrent Liabilities [Member]          
Contract with Customer, Liability, Noncurrent         $ 1,735,000