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Note 6 - Share-based Compensation and Post-retirement Benefits (Details Textual) - $ / shares | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 24, 2023 | Jun. 25, 2022 | Jun. 24, 2023 | Jun. 25, 2022 | Sep. 24, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term |  |  | 51 months |  |
Share Based Compensation Arrangement by Share Based Payment Award Fair Value Assumptions Volatility Calculation Term |  |  | 10 years |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  | 0 | 115,700 | 115,700
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  |  | $ 23.36 | $ 23.36
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period | 11,964 | 327 | 21,864 | 9,200 |
Performance Shares [Member] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period | 2,619 | 0 | 21,260 | 8,868 |

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- Definition The term calculated for volatility in fair value assumptions. + References No definition available. + Details
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- Definition Gross number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Number of shares issued under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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