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Note 2 - Revenue (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Mar. 28, 2021
Mar. 28, 2021
Sep. 27, 2020
Contract with Customer, Liability, Current $ 63,870,000 $ 63,870,000 $ 60,271,000
Contract with Customer, Liability, Revenue Recognized 12,548,000 48,562,000  
Accounts Receivable, before Allowance for Credit Loss 69,289,000 69,289,000 66,029,000
Accounts Receivable, Allowance for Credit Loss, Ending Balance $ 9,138,000 $ 9,138,000 $ 13,431,000