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Note 10 - Employee Benefit Plans - Net Periodic Pension Costs and Related Components (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Oct. 03, 2015
Pension plan settlement loss $ 2,539
Pension Plan [Member]      
Interest cost   147 130
Expected return on plan assets   (175) (181)
Pension plan settlement loss   2,539
Amortization of net loss   76 53
Net periodic pension cost   2,587 2
Supplemental Employee Retirement Plan [Member]      
Interest cost 338 326 323
Amortization of net loss 174 85 117
Net periodic pension cost 856 674 727
Service cost $ 344 $ 263 $ 287