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Note 7 - Postretirement and Postemployment Benefits (Details Textual) - USD ($)
 12 Months Ended
Sep. 29, 2019
Sep. 30, 2018
Sep. 24, 2017
Assets for Plan Benefits, Defined Benefit Plan $ 14,338,000 $ 16,157,000  
Postretirement Health Coverage [Member]      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment 2,031,000 3,741,000  
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment (7,036,000) (7,036,000)  
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax (106,000) (1,417,000)  
Assets for Plan Benefits, Defined Benefit Plan 1,955,000 $ 3,266,000  
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year 743,000    
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year $ 647,000    
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 4.50% 4.50% 4.50%
Assets for Plan Benefits, Defined Benefit Plan $ 12,383,000 $ 12,891,000  
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year 0    
Defined Benefit Plan, Benefit Obligation, Ending Balance 11,752,000 11,756,000 $ 15,667,000
Other Postretirement Benefits Plan [Member] | U.S. Small Cap Value Equity Common/Collective Fund [Member]      
Equity Securities, FV-NI 778,000 820,000  
Other Postretirement Benefits Plan [Member] | Global Equity Long/Short Common/Collective Hedge Fund-of-funds [Member]      
Equity Securities, FV-NI 3,587,000 3,616,000  
Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Assets Transferred into (out of) Level 3 0 0  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase for Purchase 0 0  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Decrease for Sale 0 0  
Postemployment Retirement Benefits [Member]      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment 0 2,031,000 $ 3,741,000
Defined Benefit Plan, Benefit Obligation, Ending Balance $ 2,550,000 $ 2,580,000