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Note 8 - Other Comprehensive Income (Loss) (Tables)
3 Months Ended
Dec. 31, 2021
Notes Tables  
Comprehensive Income (Loss) [Table Text Block]
      Tax    
  

Before-Tax

  

(Expense)

  

Net-of-Tax

 
  

Amount

  

or Benefit

  

Amount

 

Three Months Ended December 31, 2021

            

Interest rate swaps:

            

Unrealized gains

 $315,983  $(81,333) $234,650 

Transfer of realized losses to interest expense

  171,863   (44,239)  127,624 

Net interest rate swaps

  487,846   (125,572)  362,274 

Defined benefit plans:

            

Amortization of actuarial gains

  (15,070)  3,879   (11,191)

Other comprehensive income

 $472,776  $(121,693) $351,083 

Three Months Ended December 31, 2020

            

Interest rate swaps:

            

Unrealized gains

 $89,770  $(23,107) $66,663 

Transfer of realized losses to interest expense

  137,438   (35,376)  102,062 

Net interest rate swaps

  227,208   (58,483)  168,725 

Defined benefit plans:

            

Amortization of actuarial losses

  20,017   (5,153)  14,864 

Other comprehensive income

 $247,225  $(63,636) $183,589 
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
          

Accumulated

 
          

Other

 
  

Interest Rate

  

Defined Benefit

  

Comprehensive

 
  

Swaps

  

Plans

  

Income (Loss)

 

Balance at September 30, 2021

 $(888,210) $(647,224) $(1,535,434)

Other comprehensive income (loss)

  362,274   (11,191)  351,083 

Balance at December 31, 2021

 $(525,936) $(658,415) $(1,184,351)