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Note 11 - Employee Benefit Plans - Schedule of Actual and Expected Employer Contributions (Details)
3 Months Ended
Dec. 31, 2021
USD ($)
Fiscal Year-to-Date Contributions $ 0
Remaining Fiscal Year Contributions 900,000
Pension Plan [Member]  
Fiscal Year-to-Date Contributions 0
Remaining Fiscal Year Contributions 500,000
Other Postretirement Benefits Plan [Member]  
Fiscal Year-to-Date Contributions 0
Remaining Fiscal Year Contributions $ 400,000