Note 12 - Regulatory Matters - Schedule of Compliance With Regulatory Capital Requirements Under Banking Regulations (Details) - USD ($)	Jun. 30, 2024		Jun. 30, 2023
Common Equity Tier One Risk Based Capital	$ 89,200		$ 83,500
Common Equity Tier One Risk Based Capital to Risk Weighted Assets	11.07%		11.05%
Common Equity Tier One Risk Based Capital Required for Capital Adequacy	$ 36,200	[1]	$ 34,000
Common Equity Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	4.50%	[1]	4.50%
Common Equity Tier One Risk Based Capital Required to be Well Capitalized	$ 52,400		$ 49,100
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	$ 89,200		$ 83,500
Tier 1 capital to risk weighted assets Bank	0.1107		0.1105
Tier One Risk Based Capital Required for Capital Adequacy	$ 48,300	[1]	$ 45,400
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	0.06	[1]	0.06
Tier One Risk Based Capital Required to be Well Capitalized	$ 64,400		$ 60,500
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	0.08		0.08
Capital	$ 97,200		$ 91,200
Capital to Risk Weighted Assets	0.1207		0.1207
Capital Required for Capital Adequacy	$ 64,400	[1]	$ 60,500
Capital Required for Capital Adequacy to Risk Weighted Assets	0.08	[1]	0.08
Capital Required to be Well Capitalized	$ 80,600		$ 75,600
Capital Required to be Well Capitalized to Risk Weighted Assets	0.10		0.10
Tier One Leverage Capital	$ 89,200		$ 83,500
Tier One Leverage Capital to Average Assets	0.0798		0.0772
Tier One Leverage Capital Required for Capital Adequacy	$ 44,700	[1]	$ 43,300
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	0.04	[1]	0.04
Tier One Leverage Capital Required to be Well Capitalized	$ 55,900		$ 54,100
Tier One Leverage Capital Required to be Well Capitalized to Average Assets	0.05		0.05

[1] These amounts exclude the capital conservation buffer.