Note 3 - Loans and Allowance for Credit Losses - Amortized Cost of Modified Loans (Details) - USD ($)	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Modified	$ 10,727,000
Financial Asset, Not Past Due [Member]
Modified	10,727,000
Financial Asset, 30 to 89 Days Past Due [Member]
Modified	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Modified	0
Commercial Portfolio Segment [Member]
Modified	10,727,000
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Modified	10,727,000
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 89 Days Past Due [Member]
Modified	0
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Modified	0
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Modified	10,520,000	$ 9,938,000	$ 2,829,000	$ 4,973,000
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financial Asset, Not Past Due [Member]
Modified	10,520,000
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financial Asset, 30 to 89 Days Past Due [Member]
Modified	0
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Modified	0
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Modified	0	0	0	0
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | Financial Asset, Not Past Due [Member]
Modified	0
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | Financial Asset, 30 to 89 Days Past Due [Member]
Modified	0
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Modified	0
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]
Modified	207,000	87,000	89,000	10,435,000
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | Financial Asset, Not Past Due [Member]
Modified	207,000
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | Financial Asset, 30 to 89 Days Past Due [Member]
Modified	0
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Modified	0
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]
Modified	0	139,000	143,000	146,000
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | Financial Asset, Not Past Due [Member]
Modified	0
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | Financial Asset, 30 to 89 Days Past Due [Member]
Modified	0
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Modified	0
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]
Modified	0	88,000	90,000	91,000
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | Financial Asset, Not Past Due [Member]
Modified	0
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | Financial Asset, 30 to 89 Days Past Due [Member]
Modified	0
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Modified	0
Retail Portfolio Segment [Member]
Modified	0
Retail Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Modified	0
Retail Portfolio Segment [Member] | Financial Asset, 30 to 89 Days Past Due [Member]
Modified	0
Retail Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Modified	0
Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]
Modified	0	2,339,000	2,346,000	627,000
Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member] | Financial Asset, Not Past Due [Member]
Modified	0
Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member] | Financial Asset, 30 to 89 Days Past Due [Member]
Modified	0
Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Modified	0
Retail Portfolio Segment [Member] | Other Consumer Loans [Member]
Modified	0	$ 3,000	$ 13,000	$ 1,202,000
Retail Portfolio Segment [Member] | Other Consumer Loans [Member] | Financial Asset, Not Past Due [Member]
Modified	0
Retail Portfolio Segment [Member] | Other Consumer Loans [Member] | Financial Asset, 30 to 89 Days Past Due [Member]
Modified	0
Retail Portfolio Segment [Member] | Other Consumer Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Modified	$ 0