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Note 7 - Pension, Postretirement and Postemployment Defined Benefit Plans (Details Textual)
 3 Months Ended 9 Months Ended
Jun. 28, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 28, 2020
USD ($)
Jun. 30, 2019
USD ($)
Mar. 16, 2020
USD ($)
Pension Plan [Member]          
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total $ (478,000) $ (109,000) $ (408,000) $ (329,000)  
Defined Benefit Plan, Plan Assets, Contributions by Employer     $ 0    
BHMG [Member] | Pension Plan [Member]          
Defined Benefit Plan, Benefit Obligation, Ending Balance         $ 43,503,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total 642,000        
BHMG [Member] | Postemployment Retirement Benefits [Member]          
Defined Benefit Plan, Benefit Obligation, Ending Balance         $ 36,800,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total $ 590,000        
Defined Benefit Plan, Collective Bargaining Units         8
Defined Benefit Plan, Collective Bargaining Units, Capped Premiums         5
Defined Benefit Plan, Collective Bargaining Units, Uncapped Premiums         3