Note 4 - Fair Value - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Jun. 30, 2023
Securities, available-for-sale	$ 265,646	$ 279,605
Equity securities	386	386
US Treasury Securities [Member]
Securities, available-for-sale	6,192	8,408
US Government-sponsored Enterprises Debt Securities [Member]
Securities, available-for-sale	24,884	25,692
US States and Political Subdivisions Debt Securities [Member]
Securities, available-for-sale	78,947	83,972
Residential Mortgage-Backed Securities [Member]
Securities, available-for-sale	82,149	89,635
Commercial Mortgage-Backed Securities [Member]
Securities, available-for-sale	6,846	6,795
Other Debt Obligations [Member]
Securities, available-for-sale	14,591	15,033
Fair Value, Recurring [Member]
Equity securities	386	386
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Equity securities	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Equity securities	386	386
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Equity securities	0	0
Fair Value, Recurring [Member] | US Treasury Securities [Member]
Securities, available-for-sale	6,192	8,408
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale	6,192	8,408
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	0	0
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale	0	0
Fair Value, Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Securities, available-for-sale	24,884	25,692
Fair Value, Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale	0	0
Fair Value, Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	24,884	25,692
Fair Value, Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale	0	0
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Securities, available-for-sale	78,947	83,972
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale	0	0
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	78,947	83,972
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale	0	0
Fair Value, Recurring [Member] | Residential Mortgage-Backed Securities [Member]
Securities, available-for-sale	82,149	89,635
Fair Value, Recurring [Member] | Residential Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale	0	0
Fair Value, Recurring [Member] | Residential Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	82,149	89,635
Fair Value, Recurring [Member] | Residential Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale	0	0
Fair Value, Recurring [Member] | Commercial Mortgage-Backed Securities [Member]
Securities, available-for-sale	6,846	6,795
Fair Value, Recurring [Member] | Commercial Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale	0	0
Fair Value, Recurring [Member] | Commercial Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	6,846	6,795
Fair Value, Recurring [Member] | Commercial Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale	0	0
Fair Value, Recurring [Member] | Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]
Securities, available-for-sale	52,037	50,070
Fair Value, Recurring [Member] | Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale	0	0
Fair Value, Recurring [Member] | Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	52,037	50,070
Fair Value, Recurring [Member] | Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale	0	0
Fair Value, Recurring [Member] | Other Debt Obligations [Member]
Securities, available-for-sale	14,591	15,033
Fair Value, Recurring [Member] | Other Debt Obligations [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale	0	0
Fair Value, Recurring [Member] | Other Debt Obligations [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	14,591	15,033
Fair Value, Recurring [Member] | Other Debt Obligations [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale	$ 0	$ 0