Note 3: Securities: Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value (Details) - USD ($)	Mar. 31, 2019	Jun. 30, 2018
US Government-sponsored Enterprises Debt Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 0	$ 5,957
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	58
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	7,219	3,427
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	60	70
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	7,219	9,384
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	60	128
US States and Political Subdivisions Debt Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	343	14,861
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2	224
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	14,171	8,526
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	158	256
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	14,514	23,387
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	160	480
Other Debt Obligations
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	982
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	10
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,001	1,109
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	186	183
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,001	2,091
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	186	193
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	7,091	65,863
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	24	1,513
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	62,744	24,187
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,145	1,020
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	69,835	90,050
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	1,169	2,533
Total investments and mortgage-backed securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	7,434	87,663
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	26	1,805
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	85,135	37,249
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,549	1,529
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	92,569	124,912
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 1,575	$ 3,334