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Note 10 - Employee Benefit Plans (Details Textual) - USD ($)
12 Months Ended 36 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Oct. 03, 2015
Sep. 30, 2017
Sep. 27, 2014
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement $ (2,539,000)    
Pension Plan [Member]          
Defined Benefit Plan, Fair Value of Plan Assets   0 2,201,000   $ 2,253,000
Defined Benefit Plan, Plan Assets, Contributions by Employer   1,919,000 234,000    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement   (2,539,000)    
Pension Plan [Member] | Equity Funds [Member]          
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage     60.00%    
Pension Plan [Member] | Fixed Income Funds [Member]          
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage     40.00%    
Supplemental Employee Retirement Plan [Member]          
Defined Benefit Plan, Fair Value of Plan Assets  
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 290,000 290,000 290,000    
Supplemental Retirement Benefit Period 15 years        
Defined Benefit Plan Percent of Highest Average Salary Base 50.00%        
Defined Benefit Plan Number of Years in Average Annual Base Salary 5 years        
Defined Benefit Plan Number of Years Preceding Retirement for Average Annual Base Salary Calculation 10 years        
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year $ (150,000)     $ (150,000)  
Payment for Other Postretirement Benefits 40,000 25,000 25,000    
Postemployment Benefits, Period Expense $ 34,000 26,000 23,000    
Supplemental Employee Retirement Plan [Member] | Minimum [Member]          
Defined Benefit Plan Employment Term 30 years        
Reduced SERP [Member]          
Defined Benefit Plan Retirement Age 65        
Defined Benefit Plan, Reduction for Each Month 0.0028%     0.0028%  
Reduced SERP [Member] | Minimum [Member]          
Defined Benefit Plan Employment Term 10 years        
Retirement Savings Plan [Member]          
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 75.00%        
Defined Contribution Plan, Cost $ 1,100,000 1,000,000 1,000,000    
Retirement Savings Plan, First 1% of Employee Contribution [Member]          
Defined Contribution Plan, Employer Matching Contribution, Percent of Match       100.00%  
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay       1.00%  
Retirement Savings Plan, Next 5% of Employee Contribution [Member]          
Defined Contribution Plan, Employer Matching Contribution, Percent of Match       50.00%  
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay       5.00%  
VEBA [Member]          
Defined Contribution Plan, Cost 5,600,000 $ 5,400,000 $ 6,300,000    
Healthcare Coverage Claims in Excess of $ 175,000