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Note 16 - Commitments and Contingent Liabilities (Details Textual) - USD ($)
12 Months Ended
Sep. 29, 2019
Sep. 30, 2018
Sep. 24, 2017
Operating Leases, Future Minimum Payments Due, Next Twelve Months $ 3,403,000    
Operating Leases, Future Minimum Payments, Due in Two Years 2,290,000    
Operating Leases, Future Minimum Payments, Due in Three Years 2,238,000    
Operating Leases, Future Minimum Payments, Due in Four Years 1,637,000    
Operating Leases, Future Minimum Payments, Due in Five Years 1,367,000    
Operating Leases, Future Minimum Payments, Due Thereafter 4,991,000    
Operating Lease, Expense $ 4,993,000 $ 4,064,000 $ 3,866,000
Plan Partially Withdrawn From in 2017 [Member] | Multiemployer Plans, Pension [Member]      
Multiemployer Plans, Withdrawal Obligation   $ 3,255,000  
Multiemployer Plans, Withdrawal Obligation, Period   20 years  
Construction and Equipment Purchase Commitments [Member]      
Construction and Equipment, Purchase Commitments     $ 1,642,000