Note 13 - Regulatory Matters - Schedule of Compliance With Regulatory Capital Requirements Under Banking Regulations (Details) - USD ($)		Jun. 30, 2023	Jun. 30, 2022
Common Equity Tier One Risk Based Capital		$ 83,500	$ 74,100
Common Equity Tier One Risk Based Capital to Risk Weighted Assets		11.05%	11.39%
Common Equity Tier One Risk Based Capital Required for Capital Adequacy	[1]	$ 34,000.0	$ 29,300
Common Equity Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	[1]	4.50%	4.50%
Common Equity Tier One Risk Based Capital Required to be Well Capitalized		$ 49,100	$ 42,300
Common Equity Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets		6.50%	6.50%
Tier One Risk Based Capital		$ 83,500	$ 74,100
Tier 1 capital to risk weighted assets Bank		0.1105	0.1139
Tier One Risk Based Capital Required for Capital Adequacy	[1]	$ 45,400	$ 39,000.0
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	[1]	0.0600	0.0600
Tier One Risk Based Capital Required to be Well Capitalized		$ 60,500	$ 52,100
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets		0.0800	0.0800
Capital		$ 91,200	$ 81,300
Capital to Risk Weighted Assets		0.1207	0.1249
Capital Required for Capital Adequacy	[1]	$ 60,500	$ 52,100
Capital Required for Capital Adequacy to Risk Weighted Assets	[1]	0.0800	0.0800
Capital Required to be Well Capitalized		$ 75,600	$ 65,100
Capital Required to be Well Capitalized to Risk Weighted Assets		0.1000	0.1000
Tier One Leverage Capital		$ 83,500	$ 74,100
Tier One Leverage Capital to Average Assets		0.0772	0.0739
Tier One Leverage Capital Required for Capital Adequacy	[1]	$ 43,300	$ 40,100
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	[1]	0.0400	0.0400
Tier One Leverage Capital Required to be Well Capitalized		$ 54,100	$ 50,100
Tier One Leverage Capital Required to be Well Capitalized to Average Assets		0.0500	0.0500

[1] These amounts exclude the capital conservation buffer.