Note 3 - Loans and Allowance for Credit Losses - Major Classifications (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023
Gross loans	$ 762,782		$ 759,030
Unamortized deferred loan costs, net	13		84
Less allowance for credit losses	(7,844)	$ (7,948)	(7,930)	$ (7,987)	$ (7,782)	$ (7,724)
Net loans	754,951		751,184
Commercial Portfolio Segment [Member]
Gross loans	130,306		127,782
Commercial Real Estate Portfolio Segment [Member]
Less allowance for credit losses	(3,478)	(3,678)	(3,650)	(4,131)	(3,951)	(3,943)
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loans [Member]
Gross loans	158,080		163,856
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied Loans [Member]
Gross loans	145,595		146,827
Farmland [Member]
Gross loans	40,606		38,898
Less allowance for credit losses	(93)	(87)	(89)	(89)	(91)	0
Land Development [Member]
Gross loans	12,790		12,654
Less allowance for credit losses	(178)	(183)	(174)	(246)	(266)	0
Residential Portfolio Segment [Member]
Gross loans	196,742		196,098
Less allowance for credit losses	(2,086)	(2,018)	(2,018)	(1,696)	(1,638)	(1,571)
Consumer Portfolio Segment [Member]
Gross loans	78,663		72,915
Less allowance for credit losses	$ (933)	$ (894)	$ (855)	$ (870)	$ (862)	$ (902)