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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