Note 9 - Revenue From Contracts With Customers - Noninterest Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Noninterest income, financial service	$ 1,670	$ 1,492
Net gain on loans and investments	398	877
Increase in cash value of life insurance	50	47
Other	29	22
Other noninterest income	477	946
Total noninterest income	2,147	2,438
Deposit Account [Member]
Noninterest income, financial service	509	410
ATM and Debit Card Fees [Member]
Noninterest income, financial service	1,007	968
Investment Advisory, Management and Administrative Service [Member]
Noninterest income, financial service	122	82
Product and Service, Other [Member]
Noninterest income, financial service	$ 32	$ 32