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Note 11 (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 27, 2020 | Jun. 29, 2019 | Jun. 27, 2020 | Jun. 29, 2019 | Sep. 28, 2019
Debt Securities, Held-to-maturity, Total | $ 87,131,000 |  | $ 87,131,000 |  | $ 130,451,000
Proceeds from Sale and Maturity of Marketable Securities, Total | 23,187,000 | $ 6,584,000 | 54,125,000 | $ 29,721,000 |
Marketable Securities, Gain (Loss), Total | 324,000 |  | (1,746,000) | (410,000) |
Marketable Securities, Unrealized Gain (Loss), Total | 285,000 | $ (118,000) | (1,708,000) | $ (385,000) |
Corporate Bond Securities [Member] |  |  |  |  |
Debt Securities, Held-to-maturity, Total | $ 75,000,000 |  | $ 75,000,000 |  |
Investment Securities Maturity Term (Year) |  |  | 2 years |  |

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