Note 4: Loans and Allowance for Loan Losses: Schedule of Debtor Troubled Debt Restructuring, Current Period (Details)	3 Months Ended		6 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)
Total Loans
Number of modifications	0	8	0	18
Recorded investment	$ 0	$ 9,665	$ 0	$ 12,454
Consumer Loan
Number of modifications	0	0	0	0
Recorded investment	$ 0	$ 0	$ 0	$ 0
Commercial Loan
Number of modifications	0	3	0	5
Recorded investment	$ 0	$ 3,881	$ 0	$ 3,899
Construction Loan Payable
Number of modifications	0	0	0	0
Recorded investment	$ 0	$ 0	$ 0	$ 0
Residential Real Estate
Number of modifications	0	0	0	1
Recorded investment	$ 0	$ 0	$ 0	$ 702
Commercial Real Estate
Number of modifications	0	5	0	12
Recorded investment	$ 0	$ 5,784	$ 0	$ 7,853