Note 11 - Fair Values - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Collateral dependent loans	$ 3,346,000	$ 5,290,000
Foreclosed assets	51,000	0
Total	3,397,000	5,290,000
Fair Value, Inputs, Level 1 [Member]
Collateral dependent loans	0	0
Foreclosed assets	0	0
Total	0	0
Fair Value, Inputs, Level 2 [Member]
Collateral dependent loans	0	0
Foreclosed assets	0	0
Total	0	0
Fair Value, Inputs, Level 3 [Member]
Collateral dependent loans	3,346,000	5,290,000
Foreclosed assets	51,000	0
Total	$ 3,397,000	$ 5,290,000