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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Plan Partially Withdrawn From in 2017 [Member] | Multiemployer Plans, Pension [Member] |  |  |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

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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 + Details
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