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Note 11 - Summary of Securities (Details) - USD ($) $ in Thousands | Jun. 27, 2020 | Sep. 28, 2019
--- | --- | ---
Held-to-maturity securities, amortized cost | $ 87,131 | $ 130,451
Held-to-maturity securities, gross unrealized gains | 1,419 | 1,210
Held-to-maturity securities, gross unrealized losses | 75 | 36
Held-to-maturity securities, fair market value | 88,475 | 131,625
Investment securitie, cost | 15,184 | 20,147
Investment securitie, gross unrealized gains | 90 | 266
Investment securitie, gross unrealized losses | 2,042 | 510
Investment securitie, fair market value | 13,232 | 19,903
Corporate Bond Securities [Member] |  |
Held-to-maturity securities, amortized cost | 86,171 | 127,571
Held-to-maturity securities, gross unrealized gains | 1,416 | 1,204
Held-to-maturity securities, gross unrealized losses | 75 | 36
Held-to-maturity securities, fair market value | 87,512 | 128,739
Mutual Funds [Member] |  |
Investment securitie, cost | 3,588 | 5,549
Investment securitie, gross unrealized gains | 0 | 0
Investment securitie, gross unrealized losses | 786 | 495
Investment securitie, fair market value | 2,802 | 5,054
Certificates of Deposit [Member] |  |
Held-to-maturity securities, amortized cost | 960 | 2,880
Held-to-maturity securities, gross unrealized gains | 3 | 6
Held-to-maturity securities, gross unrealized losses | 0 | 0
Held-to-maturity securities, fair market value | 963 | 2,886
Preferred Stock [Member] |  |
Investment securitie, cost | 11,596 | 14,598
Investment securitie, gross unrealized gains | 90 | 266
Investment securitie, gross unrealized losses | 1,256 | 15
Investment securitie, fair market value | $ 10,430 | $ 14,849

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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). + 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=99377092&loc=SL75136599-209740 + Details
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