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Note 11 - Summary of Securities (Details) - USD ($)
$ in Thousands
Mar. 28, 2020
Sep. 28, 2019
Held-to-maturity securities, amortized cost $ 110,428 $ 130,451
Held-to-maturity securities, gross unrealized gains 532 1,210
Held-to-maturity securities, gross unrealized losses 850 36
Held-to-maturity securities, fair market value 110,109 131,625
Investment securitie, cost 15,184 20,147
Investment securitie, gross unrealized gains 0 266
Investment securitie, gross unrealized losses 2,237 510
Investment securitie, fair market value 12,947 19,903
Corporate Bond Securities [Member]    
Held-to-maturity securities, amortized cost 109,468 127,571
Held-to-maturity securities, gross unrealized gains 527 1,204
Held-to-maturity securities, gross unrealized losses 850 36
Held-to-maturity securities, fair market value 109,145 128,739
Mutual Funds [Member]    
Investment securitie, cost 3,588 5,549
Investment securitie, gross unrealized gains 0 0
Investment securitie, gross unrealized losses 862 495
Investment securitie, fair market value 2,726 5,054
Certificates of Deposit [Member]    
Held-to-maturity securities, amortized cost 960 2,880
Held-to-maturity securities, gross unrealized gains 5 6
Held-to-maturity securities, gross unrealized losses 0 0
Held-to-maturity securities, fair market value 965 2,886
Preferred Stock [Member]    
Investment securitie, cost 11,596 14,598
Investment securitie, gross unrealized gains 0 266
Investment securitie, gross unrealized losses 1,375 15
Investment securitie, fair market value $ 10,221 $ 14,849