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Note 10 - Employee Benefit Plans - Projected Benefit Obligation Reconciliation (Details) - USD ($)
 12 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Oct. 03, 2015
Sep. 30, 2017
Oct. 01, 2016
Oct. 03, 2015
Pension Plan [Member]            
Benefit obligation   $ 3,463,000 $ 3,078,000      
Interest cost   147,000 130,000      
Actuarial (gain) loss   324,000 514,000      
Plan settlement   290,000      
Distributions   (4,224,000) (259,000)      
Benefit obligation     3,463,000      
Fair value of plan assets $ 0 2,201,000 2,253,000      
Actual return on plan assets   104,000 (27,000)      
Defined Benefit Plan, Plan Assets, Contributions by Employer   1,919,000 234,000      
Plan settlement   (4,003,000)      
Distributions   (221,000) (259,000)      
Fair value of plan assets   0 2,201,000      
Funded status           $ (1,263,000)
Net amount recognized           (1,263,000)
Accrued benefit liability           (1,263,000)
Accumulated other comprehensive loss (net of tax)           1,197,000
Net amount recognized           (66,000)
Unrecognized net loss           1,930,000
Net amount recognized           1,930,000
Net loss   685,000 723,000      
Amortization of net loss   (76,000) (53,000)      
Settlement loss   (2,539,000)      
Total recognized in other comprehensive income (loss)   (1,930,000) 670,000      
Defined Benefit Plan, Fair Value of Plan Assets 0 0 2,201,000   $ 0 2,201,000
Supplemental Employee Retirement Plan [Member]            
Benefit obligation 9,159,000 7,821,000 7,480,000      
Service cost 344,000 263,000 287,000      
Interest cost 338,000 326,000 323,000      
Actuarial (gain) loss (162,000) 1,039,000 21,000      
Distributions (290,000) (290,000) (290,000)      
Benefit obligation 9,389,000 9,159,000 7,821,000      
Fair value of plan assets        
Defined Benefit Plan, Plan Assets, Contributions by Employer 290,000 290,000 290,000      
Distributions (290,000) (290,000) (290,000)      
Fair value of plan assets      
Funded status       $ (9,389,000) (9,159,000) (7,821,000)
Net amount recognized       (9,389,000) (9,159,000) (7,821,000)
Unrecognized net loss       2,149,000 2,485,000 1,531,000
Net amount recognized       2,149,000 2,485,000 1,531,000
Net loss (162,000) 1,039,000 21,000      
Amortization of net loss (174,000) (85,000) (117,000)      
Total recognized in other comprehensive income (loss) (336,000) 954,000 (96,000)      
Defined Benefit Plan, Fair Value of Plan Assets