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Note 13 (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 25, 2022 | Jun. 26, 2021 | Jun. 25, 2022 | Jun. 26, 2021 | Sep. 25, 2021
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total | $ 4,520,000 |  | $ 4,520,000 |  | $ 12,027,000
Proceeds from Sale and Maturity of Marketable Securities | 0 | $ 12,854,000 | 11,526,000 | $ 54,191,000 |
Marketable Securities, Gain (Loss) | (343,000) | 21,000 | (412,000) | 139,000 |
Marketable Securities, Unrealized Gain (Loss) | (401,000) | $ (343,000) | 786,000 | $ 137,000 |
External Credit Rating, Investment Grade [Member] |  |  |  |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total | 4,520,000 |  | 4,520,000 |  |
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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