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Note 13 - Employee Benefit Plans - Schedule of Actual and Expected Employer Contributions (Details)
6 Months Ended
Mar. 31, 2022
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
Postemployment Retirement Benefits [Member]  
Fiscal Year-to-Date Contributions 0
Remaining Fiscal Year Contributions $ 400,000