Note 8 - Fair Value Measurements - Fair Value on a Nonrecurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Assets	$ 503	$ 1,683
Fair Value, Inputs, Level 1 [Member]
Assets	0	0
Fair Value, Inputs, Level 2 [Member]
Assets	0	0
Fair Value, Inputs, Level 3 [Member]
Assets	503	1,683
Impaired Loans [Member]
Assets		1,515
Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member]
Assets		0
Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member]
Assets		0
Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Assets		1,515
Impaired Loans [Member] | Valuation, Market Approach [Member]
Assets	216
Impaired Loans [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 1 [Member]
Assets	0
Impaired Loans [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 2 [Member]
Assets	0
Impaired Loans [Member] | Valuation, Market Approach [Member] | Fair Value, Inputs, Level 3 [Member]
Assets	216
Impaired Loans [Member] | Valuation Technique, Discounted Cash Flow [Member]
Assets	286
Impaired Loans [Member] | Valuation Technique, Discounted Cash Flow [Member] | Fair Value, Inputs, Level 3 [Member]
Assets	286
Other Real Estate Owned [Member]
Assets	1	168
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 1 [Member]
Assets	0	0
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 2 [Member]
Assets	0	0
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member]
Assets	$ 1	$ 168