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Note 11 - Investment Securities - Summary of Securities (Details) - USD ($) $ in Thousands | Dec. 25, 2021 | Sep. 25, 2021
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Held-to-maturity securities, amortized cost | $ 7,544 | $ 12,027
Held-to-maturity securities, gross unrealized gains | 49 | 123
Held-to-maturity securities, gross unrealized losses | 21 | 18
Held-to-maturity securities, fair market value | 7,572 | 12,132
Investment securities, cost | 7,727 | 10,480
Investment securities, gross unrealized gains | 155 | 175
Investment securities, gross unrealized losses | 555 | 571
Investment securities, fair market value | 7,327 | 10,084
Corporate Bond Securities [Member] |  |
Held-to-maturity securities, amortized cost | 7,544 | 12,027
Held-to-maturity securities, gross unrealized gains | 49 | 123
Held-to-maturity securities, gross unrealized losses | 21 | 18
Held-to-maturity securities, fair market value | 7,572 | 12,132
Mutual Funds [Member] |  |
Investment securities, cost | 3,588 | 3,588
Investment securities, gross unrealized gains | 0 | 0
Investment securities, gross unrealized losses | 547 | 536
Investment securities, fair market value | 3,041 | 3,052
Preferred Stock [Member] |  |
Investment securities, cost | 4,139 | 6,892
Investment securities, gross unrealized gains | 155 | 175
Investment securities, gross unrealized losses | 8 | 35
Investment securities, fair market value | $ 4,286 | $ 7,032

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- Definition The accumulated amount of unrealized gain on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References No definition available. + Details
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- Definition Accumulated amount of unrealized loss on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References No definition available. + Details
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740 + Details
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- Definition Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=SL120269820-111563 + Details
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