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Note 2 - Revenue (Details Textual) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 28, 2020
Jun. 28, 2020
Sep. 29, 2019
Contract with Customer, Liability, Current $ 59,285,000 $ 59,285,000 $ 21,720,000
Contract with Customer, Liability, Revenue Recognized 2,653,000 20,512,000  
Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total 0 0 1,107,000
Accounts Receivable, before Allowance for Credit Loss 65,298,000 65,298,000 47,863,000
Accounts Receivable, Allowance for Credit Loss, Ending Balance $ 9,758,000 $ 9,758,000 $ 6,434,000