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Note 13 - Investments - Held-to-maturity Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 24, 2022 | Sep. 24, 2022
--- | --- | ---
Due in one year or less, amortized cost | $ 2,008 | $ 4,011
Due in one year or less, fair market value | 1,998 | 3,990
Due after one year through five years, amortized cost | 0 | 0
Due after one year through five years |  | 0
Due after five years through ten years, amortized cost | 0 | 0
Due after five years through ten years, fair market value | 0 | 0
Total held to maturity securities, amortized cost | 2,008 | 4,011
Held-to-maturity securities, fair market value | 1,998 | 3,990
Marketable securities held to maturity | 2,008 | 4,011
Less current portion, fair market value | 1,998 | 3,990
Long term held to maturity securities, amortized cost | 0 | 0
Long term held to maturity securities, fair market value | $ 0 | $ 0

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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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