Note 9 - Loans and Related Allowance for Loan Losses - Schedule of Performing and Non-performing Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Jun. 30, 2021
First Mortgage Loans One to Four Family Dwellings [Member]
Loans receivable	$ 63,431	$ 67,410
Consumer Loan [Member]
Loans receivable	3,313	2,875
Performing Financial Instruments [Member] | First Mortgage Loans One to Four Family Dwellings [Member]
Loans receivable	63,431	67,410
Performing Financial Instruments [Member] | Consumer Loan [Member]
Loans receivable	3,313	2,875
Nonperforming Financial Instruments [Member] | First Mortgage Loans One to Four Family Dwellings [Member]
Loans receivable	0	0
Nonperforming Financial Instruments [Member] | Consumer Loan [Member]
Loans receivable	$ 0	$ 0