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Note 7 - Postretirement and Postemployment Benefits - Allocation of Benefit Plan Assets (Details) - Other Postretirement Benefits Plan [Member]
Sep. 29, 2019
Sep. 30, 2018
Defined Benefit Plan, Equity Securities [Member]    
Asset Percentage, Policy Allocation 20.00%  
Asset Percentage, Actual Allocation 18.00% 18.00%
Defined Benefit Plan, Debt Security [Member]    
Asset Percentage, Policy Allocation 70.00%  
Asset Percentage, Actual Allocation 68.00% 69.00%
Hedge Funds [Member]    
Asset Percentage, Policy Allocation 10.00%  
Asset Percentage, Actual Allocation 14.00% 13.00%
Defined Benefit Plan, Cash and Cash Equivalents [Member]    
Asset Percentage, Policy Allocation  
Asset Percentage, Actual Allocation