Note 8 - Revenue Recognition - Noninterest Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Noninterest Income (in-scope of Topic 606)	$ 1,590	$ 1,413	$ 4,915	$ 4,150
Noninterest Income (out-of-scope of Topic 606)	402	513	1,352	1,656
Total noninterest income	1,992	1,926	6,267	5,806
Deposit Account [Member]
Noninterest Income (in-scope of Topic 606)	548	471	1,488	1,430
Product and Service, Other [Member]
Noninterest Income (in-scope of Topic 606)	50	37	134	113
Credit and Debit Card [Member]
Noninterest Income (in-scope of Topic 606)	460	339	1,373	1,031
Fiduciary and Trust [Member]
Noninterest Income (in-scope of Topic 606)	433	423	1,282	1,244
Insurance and Investment [Member]
Noninterest Income (in-scope of Topic 606)	$ 99	$ 143	$ 638	$ 332