Note 5 - Fair Value - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jun. 30, 2020
Securities, available-for-sale	$ 145,665	$ 143,918
Equity securities	400
US Treasury Securities [Member]
Securities, available-for-sale	501	1,256
US Government-sponsored Enterprises Debt Securities [Member]
Securities, available-for-sale	8,109	10,532
US States and Political Subdivisions Debt Securities [Member]
Securities, available-for-sale	67,034	63,492
Residential Mortgage Backed Securities [Member]
Securities, available-for-sale	58,248	50,156
Commercial Mortgage Backed Securities [Member]
Securities, available-for-sale	7,078	8,497
Collateralized Mortgage Obligations [Member]
Securities, available-for-sale	4,695	9,985
Fair Value, Recurring [Member]
Equity securities	400
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Equity securities
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Equity securities	400
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Equity securities
Fair Value, Recurring [Member] | US Treasury Securities [Member]
Securities, available-for-sale	501	1,256
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	501	1,256
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale
Fair Value, Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Securities, available-for-sale	8,109	10,532
Fair Value, Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale
Fair Value, Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	8,109	10,532
Fair Value, Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Securities, available-for-sale	67,034	63,492
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	67,034	63,492
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale
Fair Value, Recurring [Member] | Residential Mortgage Backed Securities [Member]
Securities, available-for-sale	58,248	50,156
Fair Value, Recurring [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale
Fair Value, Recurring [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	58,248	50,156
Fair Value, Recurring [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale
Fair Value, Recurring [Member] | Commercial Mortgage Backed Securities [Member]
Securities, available-for-sale	7,078	8,497
Fair Value, Recurring [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale
Fair Value, Recurring [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	7,078	8,497
Fair Value, Recurring [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale
Fair Value, Recurring [Member] | Collateralized Mortgage Obligations [Member]
Securities, available-for-sale	4,695
Fair Value, Recurring [Member] | Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale
Fair Value, Recurring [Member] | Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale	4,695
Fair Value, Recurring [Member] | Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale
Fair Value, Recurring [Member] | Collateralized Debt Obligations [Member]
Securities, available-for-sale		9,985
Fair Value, Recurring [Member] | Collateralized Debt Obligations [Member] | Fair Value, Inputs, Level 1 [Member]
Securities, available-for-sale
Fair Value, Recurring [Member] | Collateralized Debt Obligations [Member] | Fair Value, Inputs, Level 2 [Member]
Securities, available-for-sale		9,985
Fair Value, Recurring [Member] | Collateralized Debt Obligations [Member] | Fair Value, Inputs, Level 3 [Member]
Securities, available-for-sale