Note 9 - Revenue Recognition - Noninterest Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Noninterest Income (in-scope of Topic 606)	$ 1,459	$ 1,484
Noninterest Income (out-of-scope of Topic 606)	676	1,005
Total noninterest income	2,135	2,489
Deposit Account [Member]
Noninterest Income (in-scope of Topic 606)	582	590
Product and Service, Other [Member]
Noninterest Income (in-scope of Topic 606)	39	52
Credit and Debit Card [Member]
Noninterest Income (in-scope of Topic 606)	306	309
Fiduciary and Trust [Member]
Noninterest Income (in-scope of Topic 606)	434	397
Insurance and Investment [Member]
Noninterest Income (in-scope of Topic 606)	$ 98	$ 136