Note 9: Income Taxes: Schedule of Reconciliation of Income Tax Expense at the Statutory Rate to Actual Income Tax (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 1,308	$ 1,852	$ 5,391	$ 5,574
Other, net	(24)	(34)	(67)	(7)
Income Tax Expense, Actual	1,129	1,725	5,026	5,194
Increase (decrease) in taxes
Nontaxable Municipal Income	(109)	(103)	(335)	(295)
Current State and Local Tax Expense (Benefit)	27	128	223	352
Cash Surrender Value Of Bank-owned Life Insurance	(52)	(50)	(159)	(227)
Tax Credit Benefits	$ (21)	$ (68)	$ (27)	$ (203)