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Note C - Investment Securities (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Sep. 25, 2021 | Sep. 26, 2020 | Sep. 28, 2019 | Sep. 30, 2021
Proceeds from Sale and Maturity of Marketable Securities, Total | $ 60,891,000 | $ 73,226,000 | $ 39,158,000 |
Marketable Securities, Gain (Loss), Total | 213,000 | 83,000 | $ 27,000 |
Marketable Securities, Unrealized Gain (Loss), Total | (813,000) | (965,000) |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total | 12,027,000 | $ 68,078,000 |  |
External Credit Rating, Investment Grade [Member] |  |  |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total | $ 1,469,000 |  |  | $ 10,558,000
Mutual Fund [Member] |  |  |  |
Marketable Securities, Annual Income, Percentage | 3.50% |  |  |
Preferred Stock [Member] |  |  |  |
Marketable Securities, Annual Income, Percentage | 5.90% |  |  |
Marketable Securities, Total | $ 7,000,000 |  |  |
Marketable Securities, Annual Income, Percentage, not Subject to Tax | 50.00% |  |  |
Corporate Bond Securities [Member] |  |  |  |
Marketable Securities, Annual Income, Percentage | 3.10% |  |  |
Marketable Securities, Total | $ 12,000,000 |  |  |
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date | $ 8,000,000 |  |  |

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- Definition The annual income percentage generated by debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale. + References No definition available. + Details
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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 http://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 http://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 http://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 http://asc.fasb.org/extlink&oid=123581744&loc=d3e27232-111563 + Details
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