Note 8 - Fair Value Measurements - Fair Value on a Nonrecurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Total assets	$ 2,388	$ 121
Fair Value, Inputs, Level 1 [Member]
Total assets	0	0
Fair Value, Inputs, Level 2 [Member]
Total assets	0	0
Fair Value, Inputs, Level 3 [Member]
Total assets	2,388	121
Impaired Loans [Member] | Valuation, Market Approach [Member]
Total assets	2,378	120
Impaired Loans [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 1 [Member]
Total assets	0	0
Impaired Loans [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 2 [Member]
Total assets	0	0
Impaired Loans [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member]
Total assets	2,378	120
Other Repossessed Assets [Member] | Valuation, Market Approach [Member]
Total assets	10
Other Repossessed Assets [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 1 [Member]
Total assets	0
Other Repossessed Assets [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 2 [Member]
Total assets	0
Other Repossessed Assets [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member]
Total assets	$ 10
Other Real Estate Owned [Member]
Total assets		1
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 1 [Member]
Total assets		0
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 2 [Member]
Total assets		0
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member]
Total assets		$ 1