Note 5 - Fair Value Measurements - Estimated Fair Value of the Company's Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Reported Value Measurement [Member]
Financial assets:
Net loans	$ 1,362,685	$ 1,338,434
Financial liabilities:
Deposits	1,425,607	1,402,019
Other borrowings	12,010	12,059
Estimate of Fair Value Measurement [Member]
Financial assets:
Net loans	1,317,954	1,298,814
Financial liabilities:
Deposits	2,419,730	1,395,217
Other borrowings	12,010	12,059
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Financial assets:
Net loans	0	0
Financial liabilities:
Deposits	1,180,645	1,163,999
Other borrowings	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Financial assets:
Net loans	0	0
Financial liabilities:
Deposits	0	0
Other borrowings	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Financial assets:
Net loans	1,317,954	1,298,814
Financial liabilities:
Deposits	1,239,085	231,218
Other borrowings	$ 12,010	$ 12,059