Note 10 - Revenue From Contracts With Customers - Noninterest Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Noninterest income	$ 1,694	$ 1,670
Net gains on loans and investments	223	398
Increase in cash value of life insurance	45	50
Other	29	29
Other noninterest income	297	477
Total noninterest income	1,991	2,147
Deposit Account [Member]
Noninterest income	562	509
ATM and Debit Card Fees [Member]
Noninterest income	1,087	1,007
Investment Advisory, Management and Administrative Service [Member]
Noninterest income	12	122
Product and Service, Other [Member]
Noninterest income	$ 33	$ 32