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Note 11 (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 26, 2022 | Mar. 27, 2021 | Mar. 26, 2022 | Mar. 27, 2021 | Sep. 25, 2021
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total | $ 4,530,000 |  | $ 4,530,000 |  | $ 12,027,000
Proceeds from Sale and Maturity of Marketable Securities | 4,326,000 | $ 15,189,000 | 11,526,000 | $ 41,337,000 |
Marketable Securities, Gain (Loss) | (25,000) | 41,000 | (69,000) | 119,000 |
Marketable Securities, Unrealized Gain (Loss) | (53,000) | $ (46,000) | (58,000) | $ 649,000 |
Corporate Bond Securities [Member] |  |  |  |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total | $ 4,500,000 |  | $ 4,500,000 |  |
Investment Securities Maturity Term (Month) |  |  | 12 months |  |

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