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Income Taxes (Tables)
3 Months Ended
Dec. 31, 2019
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
A reconciliation of income tax expense from applying the federal statutory rates in effect for each period to total income tax expense is presented below:

 
Three Months Ended December 31,
 
2019
 
2018
Income before income taxes
$
5,248,523

 
$
3,136,375

Corporate federal tax rate
21.00
%
 
21.00
%
 
 
 
 
Income tax expense computed at the federal statutory rate
$
1,102,190

 
$
658,639

State income taxes, net of federal tax benefit
250,037

 
150,589

Net amortization of excess deferred taxes on regulated operations
(86,208
)
 
(86,208
)
Other, net
(24,432
)
 
(20,807
)
Total income tax expense
$
1,241,587

 
$
702,213

 
 
 
 
Effective tax rate
23.7
%
 
22.4
%