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Note 11 - Summary of Securities (Details) - USD ($)
$ in Thousands
Dec. 28, 2019
Sep. 28, 2019
Held-to-maturity securities, amortized cost $ 118,883 $ 130,451
Held-to-maturity securities, gross unrealized gains 1,239 1,210
Held-to-maturity securities, gross unrealized losses 6 36
Held-to-maturity securities, fair market value 120,116 131,625
Investment securitie, cost 16,714 20,147
Investment securitie, gross unrealized gains 264 266
Investment securitie, gross unrealized losses 437 510
Investment securitie, fair market value 16,541 19,903
Corporate Bond Securities [Member]    
Held-to-maturity securities, amortized cost 116,003 127,571
Held-to-maturity securities, gross unrealized gains 1,234 1,204
Held-to-maturity securities, gross unrealized losses 6 36
Held-to-maturity securities, fair market value 117,231 128,739
Mutual Funds [Member]    
Investment securitie, cost 3,588 5,549
Investment securitie, gross unrealized gains 0 0
Investment securitie, gross unrealized losses 389 495
Investment securitie, fair market value 3,199 5,054
Certificates of Deposit [Member]    
Held-to-maturity securities, amortized cost 2,880 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 2,885 2,886
Preferred Stock [Member]    
Investment securitie, cost 13,126 14,598
Investment securitie, gross unrealized gains 264 266
Investment securitie, gross unrealized losses 48 15
Investment securitie, fair market value $ 13,342 $ 14,849