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Note 12 - Employee Benefit Plans - Allocation of Plans' Assets (Details) - USD ($)
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Pension Plan [Member]      
Asset $ 31,054,138 $ 26,878,661 $ 28,017,797
Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Asset 11,548,901 10,431,848  
Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Asset 19,505,237 16,446,813  
Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Asset 0 0  
Other Postretirement Benefits Plan [Member]      
Asset 15,078,281 13,019,313 $ 12,138,119
Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Asset 15,078,281 13,019,313  
Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Asset 0 0  
Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Asset $ 0 $ 0  
Defined Benefit Plan, Equity Securities [Member] | Pension Plan [Member]      
Target 25.00%    
Asset 25.00% 27.00%  
Defined Benefit Plan, Equity Securities [Member] | Other Postretirement Benefits Plan [Member]      
Target 30.00%    
Asset 48.00% 43.00%  
Defined Benefit Plan, Debt Security [Member] | Pension Plan [Member]      
Target 75.00%    
Asset 75.00% 72.00%  
Defined Benefit Plan, Debt Security [Member] | Other Postretirement Benefits Plan [Member]      
Target 70.00%    
Asset 36.00% 37.00%  
Defined Benefit Plan, Cash [Member] | Pension Plan [Member]      
Asset   1.00%  
Asset $ 142,921 $ 202,218  
Defined Benefit Plan, Cash [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Asset 142,921 202,218  
Defined Benefit Plan, Cash [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Asset 0 0  
Defined Benefit Plan, Cash [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Asset $ 0 $ 0  
Defined Benefit Plan, Cash [Member] | Other Postretirement Benefits Plan [Member]      
Asset 16.00% 20.00%  
Asset $ 2,381,909 $ 2,640,622  
Defined Benefit Plan, Cash [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Asset 2,381,909 2,640,622  
Defined Benefit Plan, Cash [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Asset 0 0  
Defined Benefit Plan, Cash [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Asset 0 0  
Defined Benefit Plan, Common Collective Trust And Pooled Fund Bonds, Liability Driven Investment [Member] | Pension Plan [Member]      
Asset 19,505,237 16,446,813  
Defined Benefit Plan, Common Collective Trust And Pooled Fund Bonds, Liability Driven Investment [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Asset 0 0  
Defined Benefit Plan, Common Collective Trust And Pooled Fund Bonds, Liability Driven Investment [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Asset 19,505,237 16,446,813  
Defined Benefit Plan, Common Collective Trust And Pooled Fund Bonds, Liability Driven Investment [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Asset 0 0  
Defined Benefit Plan, Mutual Fund Bonds, Domestic Fixed Income [Member] | Other Postretirement Benefits Plan [Member]      
Asset 5,457,976 4,841,048  
Defined Benefit Plan, Mutual Fund Bonds, Domestic Fixed Income [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Asset 5,457,976 4,841,048  
Defined Benefit Plan, Mutual Fund Bonds, Domestic Fixed Income [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Asset 0 0  
Defined Benefit Plan, Mutual Fund Bonds, Domestic Fixed Income [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Asset 0 0  
Mutual Fund [Member] | Pension Plan [Member]      
Asset 3,791,697 3,000,525  
Mutual Fund [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Asset 3,791,697 3,000,525  
Mutual Fund [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Asset 0 0  
Mutual Fund [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Asset 0 0  
Defined Benefit Plan, Equity Funds, Domestic Large Cap Growth [Member] | Pension Plan [Member]      
Asset 2,073,092 2,256,767  
Defined Benefit Plan, Equity Funds, Domestic Large Cap Growth [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Asset 2,073,092 2,256,767  
Defined Benefit Plan, Equity Funds, Domestic Large Cap Growth [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Asset 0 0  
Defined Benefit Plan, Equity Funds, Domestic Large Cap Growth [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Asset 0 0  
Defined Benefit Plan, Equity Funds, Domestic Large Cap Growth [Member] | Other Postretirement Benefits Plan [Member]      
Asset 2,412,824 1,693,422  
Defined Benefit Plan, Equity Funds, Domestic Large Cap Growth [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Asset 2,412,824 1,693,422  
Defined Benefit Plan, Equity Funds, Domestic Large Cap Growth [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Asset 0 0  
Defined Benefit Plan, Equity Funds, Domestic Large Cap Growth [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Asset 0 0  
Defined Benefit Plan, Mutual Fund Bonds, Foreign Fixed Income [Member] | Other Postretirement Benefits Plan [Member]      
Asset   0  
Defined Benefit Plan, Mutual Fund Bonds, Foreign Fixed Income [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Asset   0  
Defined Benefit Plan, Mutual Fund Bonds, Foreign Fixed Income [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Asset   0  
Defined Benefit Plan, Mutual Fund Bonds, Foreign Fixed Income [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Asset   0  
Defined Benefit Plan, Equity Funds, Domestic Large Cap Value [Member] | Pension Plan [Member]      
Asset 2,469,045 2,222,733  
Defined Benefit Plan, Equity Funds, Domestic Large Cap Value [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Asset 2,469,045 2,222,733  
Defined Benefit Plan, Equity Funds, Domestic Large Cap Value [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Asset 0 0  
Defined Benefit Plan, Equity Funds, Domestic Large Cap Value [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Asset 0 0  
Defined Benefit Plan, Equity Funds, Domestic Large Cap Value [Member] | Other Postretirement Benefits Plan [Member]      
Asset 1,996,262 1,570,538  
Defined Benefit Plan, Equity Funds, Domestic Large Cap Value [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Asset 1,996,262 1,570,538  
Defined Benefit Plan, Equity Funds, Domestic Large Cap Value [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Asset 0 0  
Defined Benefit Plan, Equity Funds, Domestic Large Cap Value [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Asset 0 0  
Defined Benefit Plan, Equity Funds, Domestic Small/Mid Cap Core [Member] | Pension Plan [Member]      
Asset 1,297,579 1,082,801  
Defined Benefit Plan, Equity Funds, Domestic Small/Mid Cap Core [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Asset 1,297,579 1,082,801  
Defined Benefit Plan, Equity Funds, Domestic Small/Mid Cap Core [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Asset 0 0  
Defined Benefit Plan, Equity Funds, Domestic Small/Mid Cap Core [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Asset 0 0  
Defined Benefit Plan, Equity Funds, Domestic Small/Mid Cap Core [Member] | Other Postretirement Benefits Plan [Member]      
Asset 738,393 588,898  
Defined Benefit Plan, Equity Funds, Domestic Small/Mid Cap Core [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Asset 738,393 588,898  
Defined Benefit Plan, Equity Funds, Domestic Small/Mid Cap Core [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Asset 0 0  
Defined Benefit Plan, Equity Funds, Domestic Small/Mid Cap Core [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Asset 0 0  
Defined Benefit Plan, Mutual Funds, Foreign Large Cap Growth [Member] | Other Postretirement Benefits Plan [Member]      
Asset 532,391 433,886  
Defined Benefit Plan, Mutual Funds, Foreign Large Cap Growth [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Asset 532,391 433,886  
Defined Benefit Plan, Mutual Funds, Foreign Large Cap Growth [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Asset 0 0  
Defined Benefit Plan, Mutual Funds, Foreign Large Cap Growth [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Asset 0 0  
Defined Benefit Plan, Equity Funds, Domestic Small/Mid Cap Growth [Member] | Other Postretirement Benefits Plan [Member]      
Asset   0  
Defined Benefit Plan, Equity Funds, Domestic Small/Mid Cap Growth [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Asset   0  
Defined Benefit Plan, Equity Funds, Domestic Small/Mid Cap Growth [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Asset   0  
Defined Benefit Plan, Equity Funds, Domestic Small/Mid Cap Growth [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Asset   0  
Defined Benefit Plan, Equity Mutual Funds, Foreign Large Cap Growth [Member] | Pension Plan [Member]      
Asset 498,732 481,309  
Defined Benefit Plan, Equity Mutual Funds, Foreign Large Cap Growth [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Asset 498,732 481,309  
Defined Benefit Plan, Equity Mutual Funds, Foreign Large Cap Growth [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Asset 0 0  
Defined Benefit Plan, Equity Mutual Funds, Foreign Large Cap Growth [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Asset 0 0  
Defined Benefit Plan, Equity Funds, Foreign Large Cap Value [Member] | Pension Plan [Member]      
Asset 482,222 463,907  
Defined Benefit Plan, Equity Funds, Foreign Large Cap Value [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Asset 482,222 463,907  
Defined Benefit Plan, Equity Funds, Foreign Large Cap Value [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Asset 0 0  
Defined Benefit Plan, Equity Funds, Foreign Large Cap Value [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Asset 0 0  
Defined Benefit Plan, Equity Funds, Foreign Large Cap Value [Member] | Other Postretirement Benefits Plan [Member]      
Asset 652,023 526,364  
Defined Benefit Plan, Equity Funds, Foreign Large Cap Value [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Asset 652,023 526,364  
Defined Benefit Plan, Equity Funds, Foreign Large Cap Value [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Asset 0 0  
Defined Benefit Plan, Equity Funds, Foreign Large Cap Value [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Asset 0 0  
Defined Benefit Plan, Equity Funds, Domestic Small/Mid Cap Value [Member] | Other Postretirement Benefits Plan [Member]      
Asset   0  
Defined Benefit Plan, Equity Funds, Domestic Small/Mid Cap Value [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Asset   0  
Defined Benefit Plan, Equity Funds, Domestic Small/Mid Cap Value [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Asset   0  
Defined Benefit Plan, Equity Funds, Domestic Small/Mid Cap Value [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Asset   0  
Defined Benefit Plan, Equity Funds, Foreign Large Cap Core [Member] | Pension Plan [Member]      
Asset 793,613 721,588  
Defined Benefit Plan, Equity Funds, Foreign Large Cap Core [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Asset 793,613 721,588  
Defined Benefit Plan, Equity Funds, Foreign Large Cap Core [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Asset 0 0  
Defined Benefit Plan, Equity Funds, Foreign Large Cap Core [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Asset 0 0  
Defined Benefit Plan, Equity Funds, Foreign Large Cap Core [Member] | Other Postretirement Benefits Plan [Member]      
Asset 906,503 724,535  
Defined Benefit Plan, Equity Funds, Foreign Large Cap Core [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 1 [Member]      
Asset 906,503 724,535  
Defined Benefit Plan, Equity Funds, Foreign Large Cap Core [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Asset 0 0  
Defined Benefit Plan, Equity Funds, Foreign Large Cap Core [Member] | Other Postretirement Benefits Plan [Member] | Fair Value, Inputs, Level 3 [Member]      
Asset $ 0 $ 0