Note 11: Fair Value Measurements: Fair Value, Assets Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020
US States and Political Subdivisions Debt Securities
Fair value on a recurring basis	$ 44,487	$ 41,988
Other Debt Obligations
Fair value on a recurring basis	9,200	7,624
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Fair value on a recurring basis	121,841	126,912
Fair Value, Inputs, Level 1 | US States and Political Subdivisions Debt Securities
Fair value on a recurring basis	0	0
Fair Value, Inputs, Level 1 | Other Debt Obligations
Fair value on a recurring basis	0	0
Fair Value, Inputs, Level 1 | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Fair value on a recurring basis	0	0
Fair Value, Inputs, Level 2 | US States and Political Subdivisions Debt Securities
Fair value on a recurring basis	44,487	41,988
Fair Value, Inputs, Level 2 | Other Debt Obligations
Fair value on a recurring basis	9,200	7,624
Fair Value, Inputs, Level 2 | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Fair value on a recurring basis	121,841	126,912
Fair Value, Inputs, Level 3 | US States and Political Subdivisions Debt Securities
Fair value on a recurring basis	0	0
Fair Value, Inputs, Level 3 | Other Debt Obligations
Fair value on a recurring basis	0	0
Fair Value, Inputs, Level 3 | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Fair value on a recurring basis	$ 0	$ 0