Note 8 - Fair Value Measurements - Fair Value of Financial Instruments Measured on a Non-recurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands		Jun. 30, 2023	Dec. 31, 2022
Reported Value Measurement [Member]
Other real estate owned		$ 0	$ 0
Collateral dependent loans (¹)	[1]	4,887	638
Total assets		4,887	638
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Other real estate owned		0	0
Collateral dependent loans (¹)	[1]	0	0
Total assets		0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Other real estate owned		0	0
Collateral dependent loans (¹)	[1]	0	0
Total assets		0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Other real estate owned		0	0
Collateral dependent loans (¹)	[1]	4,887	638
Total assets		$ 4,887	$ 638

[1] As of June 30, 2023 and December 31, 2022 no reserve was recorded on collateral dependent loans.