Note 4 - Loans - Major Classifications (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021
Gross loans	$ 689,066		$ 611,567
Gross loans	689,066		611,567
Net deferred loan fees and costs	226		276
Allowance for loan losses	(7,823)	$ (7,675)	(7,160)	$ (6,997)	$ (6,932)	$ (6,471)
Net loans	681,469		604,683
Commercial Portfolio Segment [Member]
Gross loans	99,203		87,008
Gross loans	99,203		87,008
Allowance for loan losses	(1,138)	(1,006)	(960)	(1,026)	(976)	(904)
Commercial Real Estate Portfolio Segment [Member]
Allowance for loan losses	(3,981)	(4,084)	(3,927)	(3,991)	(4,049)	(3,949)
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	18,340		15,158
Gross loans	18,340		15,158
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Real Estate Loans [Member]
Gross loans	319,955		291,847
Gross loans	319,955		291,847
Residential Portfolio Segment [Member]
Allowance for loan losses	(1,747)	(1,677)	(1,645)	(1,473)	(1,490)	(1,307)
Residential Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	7,264		4,317
Gross loans	7,264		4,317
Residential Portfolio Segment [Member] | Residential Real Estate Owner Occupied Loans [Member]
Gross loans	153,760		142,244
Gross loans	153,760		142,244
Residential Portfolio Segment [Member] | Residential Real Estate Non-owner Occupied Loans [Member]
Gross loans	24,254		26,029
Gross loans	24,254		26,029
Consumer Portfolio Segment [Member]
Gross loans	66,290		44,964
Gross loans	66,290		44,964
Allowance for loan losses	$ (957)	$ (908)	$ (628)	$ (507)	$ (417)	$ (311)