Note 3 - Loans and Allowance for Credit Losses - Major Classifications (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022
Gross loans	$ 742,461		$ 710,104
Unamortized deferred loan costs, net	123		258
Less allowance for credit losses	(7,911)	$ (7,987)	(7,724)	$ (7,823)	$ (7,675)	$ (7,160)
Net loans	734,673		702,638
Commercial Portfolio Segment [Member]
Gross loans	115,402		112,558
Less allowance for credit losses			(1,308)	(1,138)	(1,006)	(960)
Commercial Real Estate Portfolio Segment [Member]
Less allowance for credit losses	(3,750)	(4,131)	(3,943)	(3,981)	(4,084)	(3,927)
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loans [Member]
Gross loans	159,732		151,005
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied Loans [Member]
Gross loans	151,555		140,002
Farmland [Member]
Gross loans	39,150		40,606
Less allowance for credit losses	(90)	(89)	0
Land Development [Member]
Gross loans	12,138		11,004
Less allowance for credit losses	(168)	(246)	0
Residential Portfolio Segment [Member]
Gross loans	191,884		189,312
Less allowance for credit losses	(1,973)	(1,696)	(1,571)	(1,747)	(1,677)	(1,645)
Consumer Portfolio Segment [Member]
Gross loans	72,600		65,617
Less allowance for credit losses	$ (853)	$ (870)	$ (902)	$ (957)	$ (908)	$ (628)