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Note 13 - Investments (Details Textual) - USD ($) | 3 Months Ended |
--- | --- | ---
Dec. 24, 2022 | Dec. 25, 2021 | Dec. 24, 2021 | Sep. 24, 2022
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total | $ 2,008,000 |  |  | $ 4,011,000
Proceeds from Sale and Maturity of Marketable Securities | 3,300,000 | $ 7,200,000 |  |
Marketable Securities, Gain (Loss) | 37,000 |  | $ 44,000 |
Marketable Securities, Unrealized Gain (Loss) | 39,000 | $ 5,000 |  |
Corporate Bond Securities [Member] |  |  |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total | $ 2,000,000 |  |  |

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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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- Definition Amount of unrealized gain (loss) on investment in marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
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