Note 8: 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, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 1,852	$ 1,986	$ 5,574	$ 6,052
Income Tax Expense, Actual	(34)	(58)	(7)	(251)
Increase (decrease) in taxes
Nontaxable Municipal Income	(103)	(115)	(295)	(341)
Current State and Local Tax Expense (Benefit)	128	287	352	530
Cash Surrender Value Of Bank-owned Life Insurance	(50)	(66)	(227)	(197)
Tax Credit Benefits	(68)	(224)	(203)	(672)
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	$ 0	$ 0	$ 0	$ 1,124