Note 9 - Fair Value Measurements - Assets Measured at Fair Value on a Nonrecurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Commercial real estate	$ 14	$ 110
Commercial real estate	0	0
Fair Value, Inputs, Level 1 [Member]
Commercial real estate	0	0
Fair Value, Inputs, Level 2 [Member]
Commercial real estate	0	0
Fair Value, Inputs, Level 3 [Member]
Commercial real estate	14	110
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Commercial real estate	14	110
Commercial real estate	0	0
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member]
Commercial real estate	0	0
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member]
Commercial real estate	0	0
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member]
Commercial real estate	$ 14	$ 110