Note 5 - Fair Value - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021
Securities, available-for-sale	$ 245,414	$ 207,760
Equity securities	424	424
Fair Value, Recurring [Member]
Equity securities	424	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	424	424
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Equity securities	0	0
US Government-sponsored Enterprises Debt Securities [Member]
Securities, available-for-sale	14,319	15,033
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Recurring [Member]
Securities, available-for-sale	14,319	15,033
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale	0	0
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	14,319	15,033
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale	0	0
US States and Political Subdivisions Debt Securities [Member]
Securities, available-for-sale	80,181	76,499
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member]
Securities, available-for-sale	80,181	76,499
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale	0	0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	80,181	76,499
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale	0	0
Residential Mortgage Backed Securities [Member]
Securities, available-for-sale	104,202	90,517
Residential Mortgage Backed Securities [Member] | Fair Value, Recurring [Member]
Securities, available-for-sale	104,202	90,517
Residential Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale	0	0
Residential Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	104,202	90,517
Residential Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale	0	0
Commercial Mortgage Backed Securities [Member]
Securities, available-for-sale	8,650	8,845
Commercial Mortgage Backed Securities [Member] | Fair Value, Recurring [Member]
Securities, available-for-sale	8,650	8,845
Commercial Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale	0	0
Commercial Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	8,650	8,845
Commercial Mortgage Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale	0	0
Collateralized Debt Obligations [Member] | Fair Value, Recurring [Member]
Securities, available-for-sale	21,989	16,374
Collateralized Debt Obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale	0	0
Collateralized Debt Obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	21,989	16,374
Collateralized Debt Obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale	0	0
Other Debt Obligations [Member]
Securities, available-for-sale	16,073	492
Other Debt Obligations [Member] | Fair Value, Recurring [Member]
Securities, available-for-sale	16,073	492
Other Debt Obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale	0	0
Other Debt Obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	16,073	492
Other Debt Obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale	$ 0	$ 0