Note 11 - Fair Values of Financial Instruments - Assets Measured on Nonrecurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Impaired loans	$ 1,950	$ 2,074
Total	1,950	2,074
Fair Value, Inputs, Level 1 [Member]
Impaired loans	0	0
Total	0	0
Fair Value, Inputs, Level 2 [Member]
Impaired loans	0	0
Total	0	0
Fair Value, Inputs, Level 3 [Member]
Impaired loans	1,950	2,074
Total	$ 1,950	$ 2,074