Note 5 - Fair Value - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Jun. 30, 2021
Securities, available-for-sale	$ 288,375	$ 207,760
Equity securities	428	424
US Treasury Securities [Member]
Securities, available-for-sale	8,525
US Government-sponsored Enterprises Debt Securities [Member]
Securities, available-for-sale	26,546	15,033
US States and Political Subdivisions Debt Securities [Member]
Securities, available-for-sale	94,283	76,499
Residential Mortgage-Backed Securities [Member]
Securities, available-for-sale	106,027	90,517
Commercial Mortgage-Backed Securities [Member]
Securities, available-for-sale	7,787	8,845
Other Debt Obligations [Member]
Securities, available-for-sale	16,819	492
Fair Value, Recurring [Member]
Equity securities	428	424
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	428	424
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	8,525
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale	8,525
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	0
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale	0
Fair Value, Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Securities, available-for-sale	26,546	15,033
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	26,546	15,033
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	94,283	76,499
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	94,283	76,499
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	106,027	90,517
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	106,027	90,517
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	7,787	8,845
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	7,787	8,845
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] | Collateralized Debt Obligations [Member]
Securities, available-for-sale	28,388	16,374
Fair Value, Recurring [Member] | Collateralized Debt Obligations [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale	0	0
Fair Value, Recurring [Member] | Collateralized Debt Obligations [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	28,388	16,374
Fair Value, Recurring [Member] | Collateralized Debt Obligations [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	16,819	492
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	16,819	492
Fair Value, Recurring [Member] | Other Debt Obligations [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale	$ 0	$ 0