Note 9 - Revenue From Contracts With Customers - Noninterest Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Noninterest income	$ 1,492	$ 1,417
Net gain (loss) on loans and investments	877	(35)
Increase in cash value of life insurance	47	47
Other	22	27
Other noninterest income	946	39
Total noninterest income	2,438	1,456
Deposit Account [Member]
Noninterest income	410	506
ATM and Debit Card Fees [Member]
Noninterest income	968	765
Investment Advisory, Management and Administrative Service [Member]
Noninterest income	82	113
Product and Service, Other [Member]
Noninterest income	$ 32	$ 33