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Note C - Investment Securities (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 24, 2022 | Sep. 25, 2021 | Sep. 26, 2020
Proceeds from Sale and Maturity of Marketable Securities | $ 12,026 | $ 60,891 | $ 73,226
Marketable Securities, Gain (Loss) | 300 | 200 | $ 100
Marketable Securities, Unrealized Gain (Loss) | (300) | 800 |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total | 4,011 | $ 12,027 |
BBB/BB/B Rating [Member] |  |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total | $ 4,000 |  |
Mutual Fund [Member] |  |  |
Marketable Securities, Annual Income, Percentage | 3.70% |  |
Marketable Securities, Total | $ 3,000 |  |
Preferred Stock [Member] |  |  |
Marketable Securities, Annual Income, Percentage | 5.50% |  |
Marketable Securities, Annual Income, Percentage, not Subject to Tax | 50.00% |  |
Corporate Bond Securities [Member] |  |  |
Marketable Securities, Annual Income, Percentage | 3.30% |  |
Marketable Securities, Total | $ 4,000 |  |
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date | $ 4,000 |  |

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- Definition The percentage of annual income percentage from debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale that is not subject to tax. + References No definition available. + Details
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- Definition Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919253-210447 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953401-111524 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27232-111563 + Details
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