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Note 10 - Other Retirement Plans - Other Retirement Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 26, 2021 | Sep. 27, 2020 | Sep. 29, 2019
GCIU- Employer Retirement Fund [Member] |  |  |
Contribution to multiemployer plan | $ 10 | $ 87 | $ 98
District No. 9 Pension Trust [Member] |  |  |
Contribution to multiemployer plan | 15 | 31 | $ 30
CWA / ITU Negotiated [Member] |  |  |
Contribution to multiemployer plan | 81 | 456 |
IAM National Pension [Member] |  |  |
Contribution to multiemployer plan | 67 | 86 |
Operating Engineers Central Pension Fund of the International Union of Operating Engineers and Participating Employers [Member] |  |  |
Contribution to multiemployer plan | $ 49 | $ 52 |

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- Definition Amount of cost for employer contribution to multiemployer plan. Multiemployer plan includes, but is not limited to, pension plan determined to be individually significant and insignificant and other postretirement benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=35742348&loc=SL14450788-114948 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=29639808&loc=d3e29008-114946 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947 + Details
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- Details
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- Details
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- Details
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