Note 3 - Loans and Allowance for Credit Losses - Major Classifications (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022
Gross loans	$ 735,062		$ 710,104
Unamortized deferred loan costs, net	165		258
Less allowance for credit losses	(7,987)	$ (7,782)	(7,724)	$ (7,675)	$ (7,546)	$ (7,160)
Net loans	727,240		702,638
Commercial Portfolio Segment [Member]
Gross loans	112,012		112,558
Less allowance for credit losses			(1,308)	(1,006)	(1,021)	(960)
Commercial Real Estate Portfolio Segment [Member]
Less allowance for credit losses	(4,131)	(3,951)	(3,943)	(4,084)	(4,072)	(3,927)
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loans [Member]
Gross loans	157,553		151,005
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied Loans [Member]
Gross loans	148,922		140,002
Farmland [Member]
Gross loans	40,670		40,606
Less allowance for credit losses	(89)	(91)	0
Land Development [Member]
Gross loans	11,555		11,004
Less allowance for credit losses	(246)	(266)	0
Residential Portfolio Segment [Member]
Gross loans	192,117		189,312
Less allowance for credit losses	(1,696)	(1,638)	(1,571)	(1,677)	(1,676)	(1,645)
Consumer Portfolio Segment [Member]
Gross loans	72,233		65,617
Less allowance for credit losses	$ (870)	$ (862)	$ (902)	$ (908)	$ (777)	$ (628)