Note 9 - Revenue Recognition - Noninterest Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Noninterest Income (in-scope of Topic 606)	$ 1,413	$ 1,576	$ 4,150	$ 4,572
Noninterest Income (out-of-scope of Topic 606)	513	522	1,656	1,871
Total noninterest income	1,926	2,098	5,806	6,443
Deposit Account [Member]
Noninterest Income (in-scope of Topic 606)	471	643	1,430	1,840
Product and Service, Other [Member]
Noninterest Income (in-scope of Topic 606)	37	46	113	149
Credit and Debit Card [Member]
Noninterest Income (in-scope of Topic 606)	339	350	1,031	1,015
Fiduciary and Trust [Member]
Noninterest Income (in-scope of Topic 606)	423	440	1,244	1,208
Insurance and Investment [Member]
Noninterest Income (in-scope of Topic 606)	$ 143	$ 97	$ 332	$ 360